Package firestore provides a client for reading and writing to a Cloud Firestore database.
See https://cloud.google.com/firestore/docs for an introduction to Cloud Firestore and additional help on using the Firestore API.
See https://godoc.org/cloud.google.com/go for authentication, timeouts, connection pooling and similar aspects of this package.
Note: you can't use both Cloud Firestore and Cloud Datastore in the same project.
Creating a Client
To start working with this package, create a client with a project ID:
ctx := context . Background () client , err := firestore . NewClient ( ctx , "projectID" ) if err != nil { // TODO: Handle error. }
CollectionRefs and DocumentRefs
In Firestore, documents are sets of key-value pairs, and collections are groups of documents. A Firestore database consists of a hierarchy of alternating collections and documents, referred to by slash-separated paths like "States/California/Cities/SanFrancisco".
This client is built around references to collections and documents. CollectionRefs and DocumentRefs are lightweight values that refer to the corresponding database entities. Creating a ref does not involve any network traffic.
states := client . Collection ( "States" ) ny := states . Doc ( "NewYork" ) // Or, in a single call: ny = client . Doc ( "States/NewYork" )
Reading
Use DocumentRef.Get to read a document. The result is a DocumentSnapshot. Call its Data method to obtain the entire document contents as a map.
docsnap , err := ny . Get ( ctx ) if err != nil { // TODO: Handle error. } dataMap := docsnap . Data () fmt . Println ( dataMap )
You can also obtain a single field with DataAt, or extract the data into a struct with DataTo. With the type definition
type State struct { Capital string `firestore:"capital"` Population float64 `firestore:"pop"` // in millions }
we can extract the document's data into a value of type State:
var nyData State if err := docsnap . DataTo ( & nyData ); err != nil { // TODO: Handle error. }
Note that this client supports struct tags beginning with "firestore:" that work like the tags of the encoding/json package, letting you rename fields, ignore them, or omit their values when empty.
To retrieve multiple documents from their references in a single call, use Client.GetAll.
docsnaps , err := client . GetAll ( ctx , [] * firestore . DocumentRef { states . Doc ( "Wisconsin" ), states . Doc ( "Ohio" ), }) if err != nil { // TODO: Handle error. } for _ , ds := range docsnaps { _ = ds // TODO: Use ds. }
Writing
For writing individual documents, use the methods on DocumentReference. Create creates a new document.
wr , err := ny . Create ( ctx , State { Capital : "Albany" , Population : 19.8 , }) if err != nil { // TODO: Handle error. } fmt . Println ( wr )
The first return value is a WriteResult, which contains the time at which the document was updated.
Create fails if the document exists. Another method, Set, either replaces an existing document or creates a new one.
ca := states . Doc ( "California" ) _ , err = ca . Set ( ctx , State { Capital : "Sacramento" , Population : 39.14 , })
To update some fields of an existing document, use Update. It takes a list of paths to update and their corresponding values.
_ , err = ca . Update ( ctx , [] firestore . Update {{Path: "capital", Value: "Sacramento"}} )
Use DocumentRef.Delete to delete a document.
_ , err = ny . Delete ( ctx )
Preconditions
You can condition Deletes or Updates on when a document was last changed. Specify these preconditions as an option to a Delete or Update method. The check and the write happen atomically with a single RPC.
docsnap , err = ca . Get ( ctx ) if err != nil { // TODO: Handle error. } _ , err = ca . Update ( ctx , [] firestore . Update {{Path: "capital", Value: "Sacramento"}} , firestore . LastUpdateTime ( docsnap . UpdateTime ))
Here we update a doc only if it hasn't changed since we read it. You could also do this with a transaction.
To perform multiple writes at once, use a WriteBatch. Its methods chain for convenience.
WriteBatch.Commit sends the collected writes to the server, where they happen atomically.
writeResults , err := client . Batch (). Create ( ny , State { Capital : "Albany" }). Update ( ca , [] firestore . Update {{Path: "capital", Value: "Sacramento"}} ). Delete ( client . Doc ( "States/WestDakota" )). Commit ( ctx )
Queries
You can use SQL to select documents from a collection. Begin with the collection, and build up a query using Select, Where and other methods of Query.
q := states . Where ( "pop" , ">" , 10 ). OrderBy ( "pop" , firestore . Desc )
Supported operators include '<', '<=', '>', '>=', '==', 'in', 'array-contains', and 'array-contains-any'.
Call the Query's Documents method to get an iterator, and use it like the other Google Cloud Client iterators.
iter := q . Documents ( ctx ) defer iter . Stop () for { doc , err := iter . Next () if err == iterator . Done { break } if err != nil { // TODO: Handle error. } fmt . Println ( doc . Data ()) }
To get all the documents in a collection, you can use the collection itself as a query.
iter = client . Collection ( "States" ). Documents ( ctx )
Firestore supports similarity search over embedding vectors. See Query.FindNearest for details.
Collection Group Partition Queries
You can partition the documents of a Collection Group allowing for smaller subqueries.
collectionGroup = client . CollectionGroup ( "States" ) partitions , err = collectionGroup . GetPartitionedQueries ( ctx , 20 )
You can also Serialize/Deserialize queries making it possible to run/stream the queries elsewhere; another process or machine for instance.
queryProtos := make ([][] byte , 0 ) for _ , query := range partitions { protoBytes , err := query . Serialize () // handle err queryProtos = append ( queryProtos , protoBytes ) ... } for _ , protoBytes := range queryProtos { query , err := client . CollectionGroup ( "" ). Deserialize ( protoBytes ) ... }
Transactions
Use a transaction to execute reads and writes atomically. All reads must happen before any writes. Transaction creation, commit, rollback and retry are handled for you by the Client.RunTransaction method; just provide a function and use the read and write methods of the Transaction passed to it.
ny := client . Doc ( "States/NewYork" ) err := client . RunTransaction ( ctx , func ( ctx context . Context , tx * firestore . Transaction ) error { doc , err := tx . Get ( ny ) // tx.Get, NOT ny.Get! if err != nil { return err } pop , err := doc . DataAt ( "pop" ) if err != nil { return err } return tx . Update ( ny , [] firestore . Update {{Path: "pop", Value: pop.(float64) + 0.2}} ) }) if err != nil { // TODO: Handle error. }
Google Cloud Firestore Emulator
This package supports the Cloud Firestore emulator, which is useful for testing and development. Environment variables are used to indicate that Firestore traffic should be directed to the emulator instead of the production Firestore service.
To install and run the emulator and its environment variables, see the documentation at https://cloud.google.com/sdk/gcloud/reference/beta/emulators/firestore/ . Once the emulator is running, set FIRESTORE_EMULATOR_HOST to the API endpoint.
// Set FIRESTORE_EMULATOR_HOST environment variable. err := os . Setenv ( "FIRESTORE_EMULATOR_HOST" , "localhost:9000" ) if err != nil { // TODO: Handle error. } // Create client as usual. client , err := firestore . NewClient ( ctx , "my-project-id" ) if err != nil { // TODO: Handle error. } defer client . Close ()
Constants
Delete, ServerTimestamp
const
(
// Delete is used as a value in a call to Update or Set with merge to indicate
// that the corresponding key should be deleted.
Delete
sentinel
=
iota
// ServerTimestamp is used as a value in a call to Update to indicate that the
// key's value should be set to the time at which the server processed
// the request.
//
// ServerTimestamp must be the value of a field directly; it cannot appear in
// array or struct values, or in any value that is itself inside an array or
// struct.
ServerTimestamp
)
DefaultDatabaseID
const
DefaultDatabaseID
=
"(default)"
DefaultDatabaseID is name of the default database
DefaultTransactionMaxAttempts
const
DefaultTransactionMaxAttempts
=
5
DefaultTransactionMaxAttempts is the default number of times to attempt a transaction.
DetectProjectID
const
DetectProjectID
=
"*detect-project-id*"
DetectProjectID is a sentinel value that instructs NewClient to detect the project ID. It is given in place of the projectID argument. NewClient will use the project ID from the given credentials or the default credentials ( https://developers.google.com/accounts/docs/application-default-credentials ) if no credentials were provided. When providing credentials, not all options will allow NewClient to extract the project ID. Specifically a JWT does not have the project ID encoded.
DocumentID
const
DocumentID
=
"__name__"
DocumentID is the special field name representing the ID of a document in queries.
Variables
LogWatchStreams
var
LogWatchStreams
=
false
LogWatchStreams controls whether watch stream status changes are logged. This feature is EXPERIMENTAL and may disappear at any time.
ReadOnly
var
ReadOnly
=
ro
{}
ReadOnly is a TransactionOption that makes the transaction read-only. Read-only transactions cannot issue write operations, but are more efficient.
Functions
func ArrayRemove
func
ArrayRemove
(
elems
...
interface
{})
arrayRemove
ArrayRemove specifies elements to be removed from whatever array already exists in the server.
If a value exists and it's an array, values are removed from it. All duplicate values are removed. If a value exists and it's not an array, the value is replaced by an empty array. If a value does not exist, an empty array is created.
ArrayRemove must be the value of a field directly; it cannot appear in array or struct values, or in any value that is itself inside an array or struct.
Example
update
package
main
import
(
"context"
"fmt"
"cloud.google.com/go/firestore"
)
func
main
()
{
ctx
:=
context
.
Background
()
client
,
err
:=
firestore
.
NewClient
(
ctx
,
"project-id"
)
if
err
!=
nil
{
// TODO: Handle error.
}
defer
client
.
Close
()
co
:=
client
.
Doc
(
"States/Colorado"
)
wr
,
err
:=
co
.
Update
(
ctx
,
[]
firestore
.
Update
{
{
Path
:
"cities"
,
Value
:
firestore
.
ArrayRemove
(
"Denver"
)},
})
if
err
!=
nil
{
// TODO: Handle error.
}
fmt
.
Println
(
wr
.
UpdateTime
)
}
func ArrayUnion
func
ArrayUnion
(
elems
...
interface
{})
arrayUnion
ArrayUnion specifies elements to be added to whatever array already exists in the server, or to create an array if no value exists.
If a value exists and it's an array, values are appended to it. Any duplicate value is ignored. If a value exists and it's not an array, the value is replaced by an array of the values in the ArrayUnion. If a value does not exist, an array of the values in the ArrayUnion is created.
ArrayUnion must be the value of a field directly; it cannot appear in array or struct values, or in any value that is itself inside an array or struct.
Examples
create
package
main
import
(
"context"
"fmt"
"cloud.google.com/go/firestore"
)
func
main
()
{
ctx
:=
context
.
Background
()
client
,
err
:=
firestore
.
NewClient
(
ctx
,
"project-id"
)
if
err
!=
nil
{
// TODO: Handle error.
}
defer
client
.
Close
()
wr
,
err
:=
client
.
Doc
(
"States/Colorado"
).
Create
(
ctx
,
map
[
string
]
interface
{}{
"cities"
:
firestore
.
ArrayUnion
(
"Denver"
,
"Golden"
,
"Boulder"
),
"pop"
:
5.5
,
})
if
err
!=
nil
{
// TODO: Handle error.
}
fmt
.
Println
(
wr
.
UpdateTime
)
}
update
package
main
import
(
"context"
"fmt"
"cloud.google.com/go/firestore"
)
func
main
()
{
ctx
:=
context
.
Background
()
client
,
err
:=
firestore
.
NewClient
(
ctx
,
"project-id"
)
if
err
!=
nil
{
// TODO: Handle error.
}
defer
client
.
Close
()
co
:=
client
.
Doc
(
"States/Colorado"
)
wr
,
err
:=
co
.
Update
(
ctx
,
[]
firestore
.
Update
{
{
Path
:
"cities"
,
Value
:
firestore
.
ArrayUnion
(
"Broomfield"
)},
})
if
err
!=
nil
{
// TODO: Handle error.
}
fmt
.
Println
(
wr
.
UpdateTime
)
}
func FieldTransformIncrement
func
FieldTransformIncrement
(
n
interface
{})
transform
FieldTransformIncrement returns a special value that can be used with Set, Create, or Update that tells the server to transform the field's current value by the given value.
The supported values are:
int, int8, int16, int32, int64
uint8, uint16, uint32
float32, float64
If the field does not yet exist, the transformation will set the field to the given value.
func FieldTransformMaximum
func
FieldTransformMaximum
(
n
interface
{})
transform
FieldTransformMaximum returns a special value that can be used with Set, Create, or Update that tells the server to set the field to the maximum of the field's current value and the given value.
The supported values are:
int, int8, int16, int32, int64
uint8, uint16, uint32
float32, float64
If the field is not an integer or double, or if the field does not yet exist, the transformation will set the field to the given value. If a maximum operation is applied where the field and the input value are of mixed types (that is - one is an integer and one is a double) the field takes on the type of the larger operand. If the operands are equivalent (e.g. 3 and 3.0), the field does not change. 0, 0.0, and -0.0 are all zero. The maximum of a zero stored value and zero input value is always the stored value. The maximum of any numeric value x and NaN is NaN.
func FieldTransformMinimum
func
FieldTransformMinimum
(
n
interface
{})
transform
FieldTransformMinimum returns a special value that can be used with Set, Create, or Update that tells the server to set the field to the minimum of the field's current value and the given value.
The supported values are:
int, int8, int16, int32, int64
uint8, uint16, uint32
float32, float64
If the field is not an integer or double, or if the field does not yet exist, the transformation will set the field to the given value. If a minimum operation is applied where the field and the input value are of mixed types (that is - one is an integer and one is a double) the field takes on the type of the smaller operand. If the operands are equivalent (e.g. 3 and 3.0), the field does not change. 0, 0.0, and -0.0 are all zero. The minimum of a zero stored value and zero input value is always the stored value. The minimum of any numeric value x and NaN is NaN.
func Increment
func
Increment
(
n
interface
{})
transform
Increment is an alias for FieldTransformIncrement.
Examples
create
package
main
import
(
"context"
"fmt"
"cloud.google.com/go/firestore"
)
func
main
()
{
ctx
:=
context
.
Background
()
client
,
err
:=
firestore
.
NewClient
(
ctx
,
"project-id"
)
if
err
!=
nil
{
// TODO: Handle error.
}
defer
client
.
Close
()
wr
,
err
:=
client
.
Doc
(
"States/Colorado"
).
Create
(
ctx
,
map
[
string
]
interface
{}{
"cities"
:
[]
string
{
"Denver"
,
"Golden"
,
"Boulder"
},
"pop"
:
firestore
.
Increment
(
7
),
// "pop" will be set to 7.
})
if
err
!=
nil
{
// TODO: Handle error.
}
fmt
.
Println
(
wr
.
UpdateTime
)
}
update
package
main
import
(
"context"
"fmt"
"cloud.google.com/go/firestore"
)
func
main
()
{
ctx
:=
context
.
Background
()
client
,
err
:=
firestore
.
NewClient
(
ctx
,
"project-id"
)
if
err
!=
nil
{
// TODO: Handle error.
}
defer
client
.
Close
()
co
:=
client
.
Doc
(
"States/Colorado"
)
wr
,
err
:=
co
.
Update
(
ctx
,
[]
firestore
.
Update
{
{
Path
:
"pop"
,
Value
:
firestore
.
Increment
(
7
)},
// "pop" will incremented by 7.
})
if
err
!=
nil
{
// TODO: Handle error.
}
fmt
.
Println
(
wr
.
UpdateTime
)
}
func MaxAttempts
func
MaxAttempts
(
n
int
)
maxAttempts
MaxAttempts is a TransactionOption that configures the maximum number of times to try a transaction. In defaults to DefaultTransactionMaxAttempts.
AggregationQuery
type
AggregationQuery
struct
{
// contains filtered or unexported fields
}
AggregationQuery allows for generating aggregation results of an underlying basic query. A single AggregationQuery can contain multiple aggregations.
func (*AggregationQuery) Get
func
(
a
*
AggregationQuery
)
Get
(
ctx
context
.
Context
)
(
AggregationResult
,
error
)
Get retrieves the aggregation query results from the service.
func (*AggregationQuery) Transaction
func
(
a
*
AggregationQuery
)
Transaction
(
tx
*
Transaction
)
*
AggregationQuery
Transaction specifies that aggregation query should run within provided transaction
func (*AggregationQuery) WithAvg
func
(
a
*
AggregationQuery
)
WithAvg
(
path
string
,
alias
string
)
*
AggregationQuery
WithAvg specifies that the aggregation query should provide an average of the values of the provided field in the results returned by the underlying Query. The alias argument can be empty or a valid Firestore document field name. It can be used as key in the AggregationResult to get the average value. If alias is empty, Firestore will autogenerate a key.
func (*AggregationQuery) WithAvgPath
func
(
a
*
AggregationQuery
)
WithAvgPath
(
fp
FieldPath
,
alias
string
)
*
AggregationQuery
WithAvgPath specifies that the aggregation query should provide an average of the values of the provided field in the results returned by the underlying Query. The path argument can be a single field or a dot-separated sequence of fields, and must not contain any of the runes "˜*/[]". The alias argument can be empty or a valid Firestore document field name. It can be used as key in the AggregationResult to get the average value. If alias is empty, Firestore will autogenerate a key.
func (*AggregationQuery) WithCount
func
(
a
*
AggregationQuery
)
WithCount
(
alias
string
)
*
AggregationQuery
WithCount specifies that the aggregation query provide a count of results returned by the underlying Query.
func (*AggregationQuery) WithSum
func
(
a
*
AggregationQuery
)
WithSum
(
path
string
,
alias
string
)
*
AggregationQuery
WithSum specifies that the aggregation query should provide a sum of the values of the provided field in the results returned by the underlying Query. The alias argument can be empty or a valid Firestore document field name. It can be used as key in the AggregationResult to get the sum value. If alias is empty, Firestore will autogenerate a key.
func (*AggregationQuery) WithSumPath
func
(
a
*
AggregationQuery
)
WithSumPath
(
fp
FieldPath
,
alias
string
)
*
AggregationQuery
WithSumPath specifies that the aggregation query should provide a sum of the values of the provided field in the results returned by the underlying Query. The path argument can be a single field or a dot-separated sequence of fields, and must not contain any of the runes "˜*/[]". The alias argument can be empty or a valid Firestore document field name. It can be used as key in the AggregationResult to get the sum value. If alias is empty, Firestore will autogenerate a key.
AggregationResult
type
AggregationResult
map
[
string
]
interface
{}
AggregationResult contains the results of an aggregation query.
AndFilter
type
AndFilter
struct
{
Filters
[]
EntityFilter
}
AndFilter represents the intersection of two or more filters.
BulkWriter
type
BulkWriter
struct
{
// contains filtered or unexported fields
}
A BulkWriter supports concurrent writes to multiple documents. The BulkWriter submits document writes in maximum batches of 20 writes per request. Each request can contain many different document writes: create, delete, update, and set are all supported.
Only one operation (create, set, update, delete) per document is allowed. BulkWriter cannot promise atomicity: individual writes can fail or succeed independent of each other. Bulkwriter does not apply writes in any set order; thus a document can't have set on it immediately after creation.
func (*BulkWriter) Create
func
(
bw
*
BulkWriter
)
Create
(
doc
*
DocumentRef
,
datum
interface
{})
(
*
BulkWriterJob
,
error
)
Create adds a document creation write to the queue of writes to send. Note: You cannot write to (Create, Update, Set, or Delete) the same document more than once.
func (*BulkWriter) Delete
func
(
bw
*
BulkWriter
)
Delete
(
doc
*
DocumentRef
,
preconds
...
Precondition
)
(
*
BulkWriterJob
,
error
)
Delete adds a document deletion write to the queue of writes to send. Note: You cannot write to (Create, Update, Set, or Delete) the same document more than once.
func (*BulkWriter) End
func
(
bw
*
BulkWriter
)
End
()
End sends all enqueued writes in parallel and closes the BulkWriter to new requests. After calling End(), calling any additional method automatically returns with an error. This method completes when there are no more pending writes in the queue.
func (*BulkWriter) Flush
func
(
bw
*
BulkWriter
)
Flush
()
Flush commits all writes that have been enqueued up to this point in parallel. This method blocks execution.
func (*BulkWriter) Set
func
(
bw
*
BulkWriter
)
Set
(
doc
*
DocumentRef
,
datum
interface
{},
opts
...
SetOption
)
(
*
BulkWriterJob
,
error
)
Set adds a document set write to the queue of writes to send. Note: You cannot write to (Create, Update, Set, or Delete) the same document more than once.
func (*BulkWriter) Update
func
(
bw
*
BulkWriter
)
Update
(
doc
*
DocumentRef
,
updates
[]
Update
,
preconds
...
Precondition
)
(
*
BulkWriterJob
,
error
)
Update adds a document update write to the queue of writes to send. Note: You cannot write to (Create, Update, Set, or Delete) the same document more than once.
BulkWriterJob
type
BulkWriterJob
struct
{
// contains filtered or unexported fields
}
BulkWriterJob provides read-only access to the results of a BulkWriter write attempt.
func (*BulkWriterJob) Results
func
(
j
*
BulkWriterJob
)
Results
()
(
*
WriteResult
,
error
)
Results gets the results of the BulkWriter write attempt. This method blocks if the results for this BulkWriterJob haven't been received.
Client
type
Client
struct
{
// contains filtered or unexported fields
}
A Client provides access to the Firestore service.
func NewClient
func
NewClient
(
ctx
context
.
Context
,
projectID
string
,
opts
...
option
.
ClientOption
)
(
*
Client
,
error
)
NewClient creates a new Firestore client that uses the given project.
Example
package
main
import
(
"context"
"cloud.google.com/go/firestore"
)
func
main
()
{
ctx
:=
context
.
Background
()
client
,
err
:=
firestore
.
NewClient
(
ctx
,
"project-id"
)
if
err
!=
nil
{
// TODO: Handle error.
}
defer
client
.
Close
()
// Close client when done.
_
=
client
// TODO: Use client.
}
func NewClientWithDatabase
func
NewClientWithDatabase
(
ctx
context
.
Context
,
projectID
string
,
databaseID
string
,
opts
...
option
.
ClientOption
)
(
*
Client
,
error
)
NewClientWithDatabase creates a new Firestore client that accesses the specified database.
func (*Client) Batch (deprecated)
func
(
c
*
Client
)
Batch
()
*
WriteBatch
Batch returns a WriteBatch.
Deprecated: The WriteBatch API has been replaced with the transaction and
the bulk writer API. For atomic transaction operations, use Transaction
.
For bulk read and write operations, use BulkWriter
.
Example
package
main
import
(
"context"
"cloud.google.com/go/firestore"
)
func
main
()
{
ctx
:=
context
.
Background
()
client
,
err
:=
firestore
.
NewClient
(
ctx
,
"project-id"
)
if
err
!=
nil
{
// TODO: Handle error.
}
defer
client
.
Close
()
b
:=
client
.
Batch
()
_
=
b
// TODO: Use batch.
}
func (*Client) BulkWriter
func
(
c
*
Client
)
BulkWriter
(
ctx
context
.
Context
)
*
BulkWriter
BulkWriter returns a BulkWriter instance. The context passed to the BulkWriter remains stored through the lifecycle of the object. This context allows callers to cancel BulkWriter operations.
func (*Client) Close
Close closes any resources held by the client.
Close need not be called at program exit.
func (*Client) Collection
func
(
c
*
Client
)
Collection
(
path
string
)
*
CollectionRef
Collection creates a reference to a collection with the given path. A path is a sequence of IDs separated by slashes.
Collection returns nil if path contains an even number of IDs or any ID is empty.
Example
package
main
import
(
"context"
"fmt"
"cloud.google.com/go/firestore"
)
func
main
()
{
ctx
:=
context
.
Background
()
client
,
err
:=
firestore
.
NewClient
(
ctx
,
"project-id"
)
if
err
!=
nil
{
// TODO: Handle error.
}
defer
client
.
Close
()
coll1
:=
client
.
Collection
(
"States"
)
coll2
:=
client
.
Collection
(
"States/NewYork/Cities"
)
fmt
.
Println
(
coll1
,
coll2
)
}
func (*Client) CollectionGroup
func
(
c
*
Client
)
CollectionGroup
(
collectionID
string
)
*
CollectionGroupRef
CollectionGroup creates a reference to a group of collections that include the given ID, regardless of parent document.
For example, consider: France/Cities/Paris = {population: 100} Canada/Cities/Montreal = {population: 90}
CollectionGroup can be used to query across all "Cities" regardless of its parent "Countries". See ExampleCollectionGroup for a complete example.
Example
package
main
import
(
"context"
"cloud.google.com/go/firestore"
)
func
main
()
{
// Given:
// France/Cities/Paris = {population: 100}
// Canada/Cities/Montreal = {population: 95}
ctx
:=
context
.
Background
()
client
,
err
:=
firestore
.
NewClient
(
ctx
,
"project-id"
)
if
err
!=
nil
{
// TODO: Handle error.
}
defer
client
.
Close
()
// Query for ANY city with >95 pop, regardless of country.
docs
,
err
:=
client
.
CollectionGroup
(
"Cities"
).
Where
(
"pop"
,
">"
,
95
).
OrderBy
(
"pop"
,
firestore
.
Desc
).
Limit
(
10
).
Documents
(
ctx
).
GetAll
()
if
err
!=
nil
{
// TODO: Handle error.
}
_
=
docs
// TODO: Use docs.
}
func (*Client) Collections
func
(
c
*
Client
)
Collections
(
ctx
context
.
Context
)
*
CollectionIterator
Collections returns an iterator over the top-level collections.
func (*Client) Doc
func
(
c
*
Client
)
Doc
(
path
string
)
*
DocumentRef
Doc creates a reference to a document with the given path. A path is a sequence of IDs separated by slashes.
Doc returns nil if path contains an odd number of IDs or any ID is empty.
Example
package
main
import
(
"context"
"fmt"
"cloud.google.com/go/firestore"
)
func
main
()
{
ctx
:=
context
.
Background
()
client
,
err
:=
firestore
.
NewClient
(
ctx
,
"project-id"
)
if
err
!=
nil
{
// TODO: Handle error.
}
defer
client
.
Close
()
doc1
:=
client
.
Doc
(
"States/NewYork"
)
doc2
:=
client
.
Doc
(
"States/NewYork/Cities/Albany"
)
fmt
.
Println
(
doc1
,
doc2
)
}
func (*Client) GetAll
func
(
c
*
Client
)
GetAll
(
ctx
context
.
Context
,
docRefs
[]
*
DocumentRef
)
(
_
[]
*
DocumentSnapshot
,
err
error
)
GetAll retrieves multiple documents with a single call. The DocumentSnapshots are returned in the order of the given DocumentRefs. The return value will always contain the same number of DocumentSnapshots as the number of DocumentRefs in the input.
If the same DocumentRef is specified multiple times in the input, the return value will contain the same number of DocumentSnapshots referencing the same document.
If a document is not present, the corresponding DocumentSnapshot's Exists method will return false.
Example
package
main
import
(
"context"
"fmt"
"cloud.google.com/go/firestore"
)
func
main
()
{
ctx
:=
context
.
Background
()
client
,
err
:=
firestore
.
NewClient
(
ctx
,
"project-id"
)
if
err
!=
nil
{
// TODO: Handle error.
}
defer
client
.
Close
()
docs
,
err
:=
client
.
GetAll
(
ctx
,
[]
*
firestore
.
DocumentRef
{
client
.
Doc
(
"States/NorthCarolina"
),
client
.
Doc
(
"States/SouthCarolina"
),
client
.
Doc
(
"States/WestCarolina"
),
client
.
Doc
(
"States/EastCarolina"
),
})
if
err
!=
nil
{
// TODO: Handle error.
}
// docs is a slice with four DocumentSnapshots, but the last two are
// nil because there is no West or East Carolina.
fmt
.
Println
(
docs
)
}
func (*Client) RunTransaction
func
(
c
*
Client
)
RunTransaction
(
ctx
context
.
Context
,
f
func
(
context
.
Context
,
*
Transaction
)
error
,
opts
...
TransactionOption
)
(
err
error
)
RunTransaction runs f in a transaction. f should use the transaction it is given for all Firestore operations. For any operation requiring a context, f should use the context it is passed, not the first argument to RunTransaction.
f must not call Commit or Rollback on the provided Transaction.
If f returns nil, RunTransaction commits the transaction. If the commit fails due to a conflicting transaction, RunTransaction retries f. It gives up and returns an error after a number of attempts that can be configured with the MaxAttempts option. If the commit succeeds, RunTransaction returns a nil error.
If f returns non-nil, then the transaction will be rolled back and this method will return the same error. The function f is not retried.
Note that when f returns, the transaction is not committed. Calling code must not assume that any of f's changes have been committed until RunTransaction returns nil.
Since f may be called more than once, f should usually be idempotent – that is, it should have the same result when called multiple times.
Example
package
main
import
(
"context"
"cloud.google.com/go/firestore"
)
func
main
()
{
ctx
:=
context
.
Background
()
client
,
err
:=
firestore
.
NewClient
(
ctx
,
"project-id"
)
if
err
!=
nil
{
// TODO: Handle error.
}
defer
client
.
Close
()
nm
:=
client
.
Doc
(
"States/NewMexico"
)
err
=
client
.
RunTransaction
(
ctx
,
func
(
ctx
context
.
Context
,
tx
*
firestore
.
Transaction
)
error
{
doc
,
err
:=
tx
.
Get
(
nm
)
// tx.Get, NOT nm.Get!
if
err
!=
nil
{
return
err
}
pop
,
err
:=
doc
.
DataAt
(
"pop"
)
if
err
!=
nil
{
return
err
}
return
tx
.
Update
(
nm
,
[]
firestore
.
Update
{{Path: "pop", Value: pop.(float64) + 0.2}} )
})
if
err
!=
nil
{
// TODO: Handle error.
}
}
func (*Client) WithReadOptions
func
(
c
*
Client
)
WithReadOptions
(
opts
...
ReadOption
)
*
Client
WithReadOptions specifies constraints for accessing documents from the database, e.g. at what time snapshot to read the documents.
CollectionGroupRef
type
CollectionGroupRef
struct
{
// Use the methods of Query on a CollectionGroupRef to create and run queries.
Query
// contains filtered or unexported fields
}
A CollectionGroupRef is a reference to a group of collections sharing the same ID.
func (CollectionGroupRef) GetPartitionedQueries
func
(
cgr
CollectionGroupRef
)
GetPartitionedQueries
(
ctx
context
.
Context
,
partitionCount
int
)
([]
Query
,
error
)
GetPartitionedQueries returns a slice of Query objects, each containing a partition of a collection group. partitionCount must be a positive value and the number of returned partitions may be less than the requested number if providing the desired number would result in partitions with very few documents.
If a Collection Group Query would return a large number of documents, this can help to subdivide the query to smaller working units that can be distributed.
If the goal is to run the queries across processes or workers, it may be useful to use Query.Serialize
and Query.Deserialize
to serialize the query.
CollectionIterator
type
CollectionIterator
struct
{
// contains filtered or unexported fields
}
CollectionIterator is an iterator over sub-collections of a document.
func (*CollectionIterator) GetAll
func
(
it
*
CollectionIterator
)
GetAll
()
([]
*
CollectionRef
,
error
)
GetAll returns all the collections remaining from the iterator.
func (*CollectionIterator) Next
func
(
it
*
CollectionIterator
)
Next
()
(
*
CollectionRef
,
error
)
Next returns the next result. Its second return value is iterator.Done if there are no more results. Once Next returns Done, all subsequent calls will return Done.
func (*CollectionIterator) PageInfo
func
(
it
*
CollectionIterator
)
PageInfo
()
*
iterator
.
PageInfo
PageInfo supports pagination. See the google.golang.org/api/iterator package for details.
CollectionRef
type
CollectionRef
struct
{
// Parent is the document of which this collection is a part. It is
// nil for top-level collections.
Parent
*
DocumentRef
// The full resource path of the collection: "projects/P/databases/D/documents..."
Path
string
// ID is the collection identifier.
ID
string
// Use the methods of Query on a CollectionRef to create and run queries.
Query
// contains filtered or unexported fields
}
A CollectionRef is a reference to Firestore collection.
func (*CollectionRef) Add
func
(
c
*
CollectionRef
)
Add
(
ctx
context
.
Context
,
data
interface
{})
(
*
DocumentRef
,
*
WriteResult
,
error
)
Add generates a DocumentRef with a unique ID. It then creates the document with the given data, which can be a map[string]interface{}, a struct or a pointer to a struct.
Add returns an error in the unlikely event that a document with the same ID already exists.
Example
package
main
import
(
"context"
"fmt"
"cloud.google.com/go/firestore"
)
func
main
()
{
ctx
:=
context
.
Background
()
client
,
err
:=
firestore
.
NewClient
(
ctx
,
"project-id"
)
if
err
!=
nil
{
// TODO: Handle error.
}
defer
client
.
Close
()
doc
,
wr
,
err
:=
client
.
Collection
(
"Users"
).
Add
(
ctx
,
map
[
string
]
interface
{}{
"name"
:
"Alice"
,
"email"
:
"aj@example.com"
,
})
if
err
!=
nil
{
// TODO: Handle error.
}
fmt
.
Println
(
doc
,
wr
)
}
func (*CollectionRef) Doc
func
(
c
*
CollectionRef
)
Doc
(
id
string
)
*
DocumentRef
Doc returns a DocumentRef that refers to the document in the collection with the given identifier.
Example
package
main
import
(
"context"
"fmt"
"cloud.google.com/go/firestore"
)
func
main
()
{
ctx
:=
context
.
Background
()
client
,
err
:=
firestore
.
NewClient
(
ctx
,
"project-id"
)
if
err
!=
nil
{
// TODO: Handle error.
}
defer
client
.
Close
()
fl
:=
client
.
Collection
(
"States"
).
Doc
(
"Florida"
)
ta
:=
client
.
Collection
(
"States"
).
Doc
(
"Florida/Cities/Tampa"
)
fmt
.
Println
(
fl
,
ta
)
}
func (*CollectionRef) DocumentRefs
func
(
c
*
CollectionRef
)
DocumentRefs
(
ctx
context
.
Context
)
*
DocumentRefIterator
DocumentRefs returns references to all the documents in the collection, including missing documents. A missing document is a document that does not exist but has sub-documents.
func (*CollectionRef) NewDoc
func
(
c
*
CollectionRef
)
NewDoc
()
*
DocumentRef
NewDoc returns a DocumentRef with a uniquely generated ID.
NewDoc will panic if crypto/rand cannot generate enough bytes to make a new doc ID.
Example
package
main
import
(
"context"
"fmt"
"cloud.google.com/go/firestore"
)
func
main
()
{
ctx
:=
context
.
Background
()
client
,
err
:=
firestore
.
NewClient
(
ctx
,
"project-id"
)
if
err
!=
nil
{
// TODO: Handle error.
}
defer
client
.
Close
()
doc
:=
client
.
Collection
(
"Users"
).
NewDoc
()
fmt
.
Println
(
doc
)
}
func (*CollectionRef) WithReadOptions
func
(
c
*
CollectionRef
)
WithReadOptions
(
opts
...
ReadOption
)
*
CollectionRef
WithReadOptions specifies constraints for accessing documents from the database, e.g. at what time snapshot to read the documents.
CompositeFilter
type
CompositeFilter
interface
{
EntityFilter
// contains filtered or unexported methods
}
CompositeFilter represents a composite Firestore filter.
Direction
type
Direction
int32
Direction is the sort direction for result ordering.
Asc, Desc
const
(
// Asc sorts results from smallest to largest.
Asc
Direction
=
Direction
(
pb
.
StructuredQuery_ASCENDING
)
// Desc sorts results from largest to smallest.
Desc
Direction
=
Direction
(
pb
.
StructuredQuery_DESCENDING
)
)
DistanceMeasure
type
DistanceMeasure
int32
DistanceMeasure is the distance measure to use when comparing vectors with [Query.FindNearest] or [Query.FindNearestPath].
DistanceMeasureEuclidean, DistanceMeasureCosine, DistanceMeasureDotProduct
const
(
// DistanceMeasureEuclidean is used to measures the Euclidean distance between the vectors. See
// [Euclidean] to learn more.
//
// [Euclidean]: https://en.wikipedia.org/wiki/Euclidean_distance
DistanceMeasureEuclidean
DistanceMeasure
=
DistanceMeasure
(
pb
.
StructuredQuery_FindNearest_EUCLIDEAN
)
// DistanceMeasureCosine compares vectors based on the angle between them, which allows you to
// measure similarity that isn't based on the vectors magnitude.
// We recommend using dot product with unit normalized vectors instead of
// cosine distance, which is mathematically equivalent with better
// performance. See [Cosine Similarity] to learn more.
//
// [Cosine Similarity]: https://en.wikipedia.org/wiki/Cosine_similarity
DistanceMeasureCosine
DistanceMeasure
=
DistanceMeasure
(
pb
.
StructuredQuery_FindNearest_COSINE
)
// DistanceMeasureDotProduct is similar to cosine but is affected by the magnitude of the vectors. See
// [Dot Product] to learn more.
//
// [Dot Product]: https://en.wikipedia.org/wiki/Dot_product
DistanceMeasureDotProduct
DistanceMeasure
=
DistanceMeasure
(
pb
.
StructuredQuery_FindNearest_DOT_PRODUCT
)
)
DocumentChange
type
DocumentChange
struct
{
Kind
DocumentChangeKind
Doc
*
DocumentSnapshot
// The zero-based index of the document in the sequence of query results prior to this change,
// or -1 if the document was not present.
OldIndex
int
// The zero-based index of the document in the sequence of query results after this change,
// or -1 if the document is no longer present.
NewIndex
int
}
A DocumentChange describes the change to a document from one query snapshot to the next.
DocumentChangeKind
type
DocumentChangeKind
int
DocumentChangeKind describes the kind of change to a document between query snapshots.
DocumentAdded, DocumentRemoved, DocumentModified
const
(
// DocumentAdded indicates that the document was added for the first time.
DocumentAdded
DocumentChangeKind
=
iota
// DocumentRemoved indicates that the document was removed.
DocumentRemoved
// DocumentModified indicates that the document was modified.
DocumentModified
)
DocumentIterator
type
DocumentIterator
struct
{
// contains filtered or unexported fields
}
DocumentIterator is an iterator over documents returned by a query.
func (*DocumentIterator) GetAll
func
(
it
*
DocumentIterator
)
GetAll
()
([]
*
DocumentSnapshot
,
error
)
GetAll returns all the documents remaining from the iterator. It is not necessary to call Stop on the iterator after calling GetAll.
Example
package
main
import
(
"context"
"fmt"
"cloud.google.com/go/firestore"
)
func
main
()
{
ctx
:=
context
.
Background
()
client
,
err
:=
firestore
.
NewClient
(
ctx
,
"project-id"
)
if
err
!=
nil
{
// TODO: Handle error.
}
defer
client
.
Close
()
q
:=
client
.
Collection
(
"States"
).
Where
(
"pop"
,
">"
,
10
).
OrderBy
(
"pop"
,
firestore
.
Desc
).
Limit
(
10
)
// a good idea with GetAll, to avoid filling memory
docs
,
err
:=
q
.
Documents
(
ctx
).
GetAll
()
if
err
!=
nil
{
// TODO: Handle error.
}
for
_
,
doc
:=
range
docs
{
fmt
.
Println
(
doc
.
Data
())
}
}
func (*DocumentIterator) Next
func
(
it
*
DocumentIterator
)
Next
()
(
*
DocumentSnapshot
,
error
)
Next returns the next result. Its second return value is iterator.Done if there are no more results. Once Next returns Done, all subsequent calls will return Done.
Example
package
main
import
(
"context"
"fmt"
"cloud.google.com/go/firestore"
"google.golang.org/api/iterator"
)
func
main
()
{
ctx
:=
context
.
Background
()
client
,
err
:=
firestore
.
NewClient
(
ctx
,
"project-id"
)
if
err
!=
nil
{
// TODO: Handle error.
}
defer
client
.
Close
()
q
:=
client
.
Collection
(
"States"
).
Where
(
"pop"
,
">"
,
10
).
OrderBy
(
"pop"
,
firestore
.
Desc
)
iter
:=
q
.
Documents
(
ctx
)
defer
iter
.
Stop
()
for
{
doc
,
err
:=
iter
.
Next
()
if
err
==
iterator
.
Done
{
break
}
if
err
!=
nil
{
// TODO: Handle error.
}
fmt
.
Println
(
doc
.
Data
())
}
}
func (*DocumentIterator) Stop
func
(
it
*
DocumentIterator
)
Stop
()
Stop stops the iterator, freeing its resources. Always call Stop when you are done with a DocumentIterator. It is not safe to call Stop concurrently with Next.
DocumentRef
type
DocumentRef
struct
{
// The CollectionRef that this document is a part of. Never nil.
Parent
*
CollectionRef
// The full resource path of the document. A document "doc-1" in collection
// "coll-1" would be: "projects/P/databases/D/documents/coll-1/doc-1".
Path
string
// The ID of the document: the last component of the resource path.
ID
string
// contains filtered or unexported fields
}
A DocumentRef is a reference to a Firestore document.
func (*DocumentRef) Collection
func
(
d
*
DocumentRef
)
Collection
(
id
string
)
*
CollectionRef
Collection returns a reference to sub-collection of this document.
Example
package
main
import
(
"context"
"fmt"
"cloud.google.com/go/firestore"
)
func
main
()
{
ctx
:=
context
.
Background
()
client
,
err
:=
firestore
.
NewClient
(
ctx
,
"project-id"
)
if
err
!=
nil
{
// TODO: Handle error.
}
defer
client
.
Close
()
mi
:=
client
.
Collection
(
"States"
).
Doc
(
"Michigan"
)
cities
:=
mi
.
Collection
(
"Cities"
)
fmt
.
Println
(
cities
)
}
func (*DocumentRef) Collections
func
(
d
*
DocumentRef
)
Collections
(
ctx
context
.
Context
)
*
CollectionIterator
Collections returns an iterator over the immediate sub-collections of the document.
func (*DocumentRef) Create
func
(
d
*
DocumentRef
)
Create
(
ctx
context
.
Context
,
data
interface
{})
(
_
*
WriteResult
,
err
error
)
Create creates the document with the given data. It returns an error if a document with the same ID already exists.
The data argument can be a map with string keys, a struct, or a pointer to a struct. The map keys or exported struct fields become the fields of the firestore document. The values of data are converted to Firestore values as follows:
- bool converts to Bool.
- string converts to String.
- int, int8, int16, int32 and int64 convert to Integer.
- uint8, uint16 and uint32 convert to Integer. uint, uint64 and uintptr are disallowed, because they may be able to represent values that cannot be represented in an int64, which is the underlying type of a Integer.
- float32 and float64 convert to Double.
- []byte converts to Bytes.
- time.Time and *ts.Timestamp convert to Timestamp. ts is the package "google.golang.org/protobuf/types/known/timestamppb".
- *latlng.LatLng converts to GeoPoint. latlng is the package "google.golang.org/genproto/googleapis/type/latlng". You should always use a pointer to a LatLng.
- Slices convert to Array.
- *firestore.DocumentRef converts to Reference.
- Maps and structs convert to Map.
- nils of any type convert to Null.
Pointers and interface{} are also permitted, and their elements processed recursively.
Struct fields can have tags like those used by the encoding/json package. Tags begin with "firestore:" and are followed by "-", meaning "ignore this field," or an alternative name for the field. Following the name, these comma-separated options may be provided:
- omitempty: Do not encode this field if it is empty. A value is empty if it is a zero value, or an array, slice or map of length zero.
- serverTimestamp: The field must be of type time.Time. serverTimestamp is a sentinel token that tells Firestore to substitute the server time into that field. When writing, if the field has the zero value, the server will populate the stored document with the time that the request is processed. However, if the field value is non-zero it won't be saved.
Examples
map
package
main
import
(
"context"
"fmt"
"cloud.google.com/go/firestore"
)
func
main
()
{
ctx
:=
context
.
Background
()
client
,
err
:=
firestore
.
NewClient
(
ctx
,
"project-id"
)
if
err
!=
nil
{
// TODO: Handle error.
}
defer
client
.
Close
()
wr
,
err
:=
client
.
Doc
(
"States/Colorado"
).
Create
(
ctx
,
map
[
string
]
interface
{}{
"capital"
:
"Denver"
,
"pop"
:
5.5
,
})
if
err
!=
nil
{
// TODO: Handle error.
}
fmt
.
Println
(
wr
.
UpdateTime
)
}
struct
package
main
import
(
"context"
"fmt"
"cloud.google.com/go/firestore"
)
func
main
()
{
ctx
:=
context
.
Background
()
client
,
err
:=
firestore
.
NewClient
(
ctx
,
"project-id"
)
if
err
!=
nil
{
// TODO: Handle error.
}
defer
client
.
Close
()
type
State
struct
{
Capital
string
`firestore:"capital"`
Population
float64
`firestore:"pop"`
// in millions
}
wr
,
err
:=
client
.
Doc
(
"States/Colorado"
).
Create
(
ctx
,
State
{
Capital
:
"Denver"
,
Population
:
5.5
,
})
if
err
!=
nil
{
// TODO: Handle error.
}
fmt
.
Println
(
wr
.
UpdateTime
)
}
func (*DocumentRef) Delete
func
(
d
*
DocumentRef
)
Delete
(
ctx
context
.
Context
,
preconds
...
Precondition
)
(
_
*
WriteResult
,
err
error
)
Delete deletes the document. If the document doesn't exist, it does nothing and returns no error.
Example
package
main
import
(
"context"
"cloud.google.com/go/firestore"
)
func
main
()
{
ctx
:=
context
.
Background
()
client
,
err
:=
firestore
.
NewClient
(
ctx
,
"project-id"
)
if
err
!=
nil
{
// TODO: Handle error.
}
defer
client
.
Close
()
// Oops, Ontario is a Canadian province...
if
_
,
err
=
client
.
Doc
(
"States/Ontario"
).
Delete
(
ctx
);
err
!=
nil
{
// TODO: Handle error.
}
}
func (*DocumentRef) Get
func
(
d
*
DocumentRef
)
Get
(
ctx
context
.
Context
)
(
_
*
DocumentSnapshot
,
err
error
)
Get retrieves the document. If the document does not exist, Get return a NotFound error, which can be checked with
status.Code(err) == codes.NotFound
In that case, Get returns a non-nil DocumentSnapshot whose Exists method return false and whose ReadTime is the time of the failed read operation.
Example
package
main
import
(
"context"
"cloud.google.com/go/firestore"
)
func
main
()
{
ctx
:=
context
.
Background
()
client
,
err
:=
firestore
.
NewClient
(
ctx
,
"project-id"
)
if
err
!=
nil
{
// TODO: Handle error.
}
defer
client
.
Close
()
docsnap
,
err
:=
client
.
Doc
(
"States/Ohio"
).
Get
(
ctx
)
if
err
!=
nil
{
// TODO: Handle error.
}
_
=
docsnap
// TODO: Use DocumentSnapshot.
}
func (*DocumentRef) Set
func
(
d
*
DocumentRef
)
Set
(
ctx
context
.
Context
,
data
interface
{},
opts
...
SetOption
)
(
_
*
WriteResult
,
err
error
)
Set creates or overwrites the document with the given data. See DocumentRef.Create for the acceptable values of data. Without options, Set overwrites the document completely. Specify one of the Merge options to preserve an existing document's fields. To delete some fields, use a Merge option with firestore.Delete as the field value.
Examples
package
main
import
(
"context"
"fmt"
"cloud.google.com/go/firestore"
)
func
main
()
{
ctx
:=
context
.
Background
()
client
,
err
:=
firestore
.
NewClient
(
ctx
,
"project-id"
)
if
err
!=
nil
{
// TODO: Handle error.
}
defer
client
.
Close
()
// Overwrite the document with the given data. Any other fields currently
// in the document will be removed.
wr
,
err
:=
client
.
Doc
(
"States/Alabama"
).
Set
(
ctx
,
map
[
string
]
interface
{}{
"capital"
:
"Montgomery"
,
"pop"
:
4.9
,
})
if
err
!=
nil
{
// TODO: Handle error.
}
fmt
.
Println
(
wr
.
UpdateTime
)
}
merge
package
main
import
(
"context"
"cloud.google.com/go/firestore"
)
func
main
()
{
ctx
:=
context
.
Background
()
client
,
err
:=
firestore
.
NewClient
(
ctx
,
"project-id"
)
if
err
!=
nil
{
// TODO: Handle error.
}
defer
client
.
Close
()
// Overwrite only the fields in the map; preserve all others.
_
,
err
=
client
.
Doc
(
"States/Alabama"
).
Set
(
ctx
,
map
[
string
]
interface
{}{
"pop"
:
5.2
,
},
firestore
.
MergeAll
)
if
err
!=
nil
{
// TODO: Handle error.
}
type
State
struct
{
Capital
string
`firestore:"capital"`
Population
float64
`firestore:"pop"`
// in millions
}
// To do a merging Set with struct data, specify the exact fields to overwrite.
// MergeAll is disallowed here, because it would probably be a mistake: the "capital"
// field would be overwritten with the empty string.
_
,
err
=
client
.
Doc
(
"States/Alabama"
).
Set
(
ctx
,
State
{
Population
:
5.2
},
firestore
.
Merge
([]
string
{
"pop"
}))
if
err
!=
nil
{
// TODO: Handle error.
}
}
func (*DocumentRef) Snapshots
func
(
d
*
DocumentRef
)
Snapshots
(
ctx
context
.
Context
)
*
DocumentSnapshotIterator
Snapshots returns an iterator over snapshots of the document. Each time the document changes or is added or deleted, a new snapshot will be generated.
Example
package
main
import
(
"context"
"cloud.google.com/go/firestore"
)
func
main
()
{
ctx
:=
context
.
Background
()
client
,
err
:=
firestore
.
NewClient
(
ctx
,
"project-id"
)
if
err
!=
nil
{
// TODO: Handle error.
}
defer
client
.
Close
()
iter
:=
client
.
Doc
(
"States/Idaho"
).
Snapshots
(
ctx
)
defer
iter
.
Stop
()
for
{
docsnap
,
err
:=
iter
.
Next
()
if
err
!=
nil
{
// TODO: Handle error.
}
_
=
docsnap
// TODO: Use DocumentSnapshot.
}
}
func (*DocumentRef) Update
func
(
d
*
DocumentRef
)
Update
(
ctx
context
.
Context
,
updates
[]
Update
,
preconds
...
Precondition
)
(
_
*
WriteResult
,
err
error
)
Update updates the document. The values at the given field paths are replaced, but other fields of the stored document are untouched.
Example
package
main
import
(
"context"
"fmt"
"cloud.google.com/go/firestore"
)
func
main
()
{
ctx
:=
context
.
Background
()
client
,
err
:=
firestore
.
NewClient
(
ctx
,
"project-id"
)
if
err
!=
nil
{
// TODO: Handle error.
}
defer
client
.
Close
()
tenn
:=
client
.
Doc
(
"States/Tennessee"
)
wr
,
err
:=
tenn
.
Update
(
ctx
,
[]
firestore
.
Update
{
{
Path
:
"pop"
,
Value
:
6.6
},
{
FieldPath
:
[]
string
{
"."
,
"*"
,
"/"
},
Value
:
"odd"
},
})
if
err
!=
nil
{
// TODO: Handle error.
}
fmt
.
Println
(
wr
.
UpdateTime
)
}
func (*DocumentRef) WithReadOptions
func
(
d
*
DocumentRef
)
WithReadOptions
(
opts
...
ReadOption
)
*
DocumentRef
WithReadOptions specifies constraints for accessing documents from the database, e.g. at what time snapshot to read the documents.
DocumentRefIterator
type
DocumentRefIterator
struct
{
// contains filtered or unexported fields
}
DocumentRefIterator is an iterator over DocumentRefs.
func (*DocumentRefIterator) GetAll
func
(
it
*
DocumentRefIterator
)
GetAll
()
([]
*
DocumentRef
,
error
)
GetAll returns all the DocumentRefs remaining from the iterator.
func (*DocumentRefIterator) Next
func
(
it
*
DocumentRefIterator
)
Next
()
(
*
DocumentRef
,
error
)
Next returns the next result. Its second return value is iterator.Done if there are no more results. Once Next returns Done, all subsequent calls will return Done.
func (*DocumentRefIterator) PageInfo
func
(
it
*
DocumentRefIterator
)
PageInfo
()
*
iterator
.
PageInfo
PageInfo supports pagination. See the google.golang.org/api/iterator package for details.
DocumentSnapshot
type
DocumentSnapshot
struct
{
// The DocumentRef for this document.
Ref
*
DocumentRef
// Read-only. The time at which the document was created.
// Increases monotonically when a document is deleted then
// recreated. It can also be compared to values from other documents and
// the read time of a query.
CreateTime
time
.
Time
// Read-only. The time at which the document was last changed. This value
// is initially set to CreateTime then increases monotonically with each
// change to the document. It can also be compared to values from other
// documents and the read time of a query.
UpdateTime
time
.
Time
// Read-only. The time at which the document was read.
ReadTime
time
.
Time
// contains filtered or unexported fields
}
A DocumentSnapshot contains document data and metadata.
func (*DocumentSnapshot) Data
func
(
d
*
DocumentSnapshot
)
Data
()
map
[
string
]
interface
{}
Data returns the DocumentSnapshot's fields as a map. It is equivalent to
var m map[string]interface{}
d.DataTo(&m)
except that it returns nil if the document does not exist.
Example
package
main
import
(
"context"
"fmt"
"cloud.google.com/go/firestore"
)
func
main
()
{
ctx
:=
context
.
Background
()
client
,
err
:=
firestore
.
NewClient
(
ctx
,
"project-id"
)
if
err
!=
nil
{
// TODO: Handle error.
}
defer
client
.
Close
()
docsnap
,
err
:=
client
.
Doc
(
"States/Ohio"
).
Get
(
ctx
)
if
err
!=
nil
{
// TODO: Handle error.
}
ohioMap
:=
docsnap
.
Data
()
fmt
.
Println
(
ohioMap
[
"capital"
])
}
func (*DocumentSnapshot) DataAt
func
(
d
*
DocumentSnapshot
)
DataAt
(
path
string
)
(
interface
{},
error
)
DataAt returns the data value denoted by path.
The path argument can be a single field or a dot-separated sequence of fields, and must not contain any of the runes "˜*/[]". Use DataAtPath instead for such a path.
See DocumentSnapshot.DataTo for how Firestore values are converted to Go values.
If the document does not exist, DataAt returns a NotFound error.
Example
package
main
import
(
"context"
"fmt"
"cloud.google.com/go/firestore"
)
func
main
()
{
ctx
:=
context
.
Background
()
client
,
err
:=
firestore
.
NewClient
(
ctx
,
"project-id"
)
if
err
!=
nil
{
// TODO: Handle error.
}
defer
client
.
Close
()
docsnap
,
err
:=
client
.
Doc
(
"States/Ohio"
).
Get
(
ctx
)
if
err
!=
nil
{
// TODO: Handle error.
}
cap
,
err
:=
docsnap
.
DataAt
(
"capital"
)
if
err
!=
nil
{
// TODO: Handle error.
}
fmt
.
Println
(
cap
)
}
func (*DocumentSnapshot) DataAtPath
func
(
d
*
DocumentSnapshot
)
DataAtPath
(
fp
FieldPath
)
(
interface
{},
error
)
DataAtPath returns the data value denoted by the FieldPath fp. If the document does not exist, DataAtPath returns a NotFound error.
Example
package
main
import
(
"context"
"fmt"
"cloud.google.com/go/firestore"
)
func
main
()
{
ctx
:=
context
.
Background
()
client
,
err
:=
firestore
.
NewClient
(
ctx
,
"project-id"
)
if
err
!=
nil
{
// TODO: Handle error.
}
defer
client
.
Close
()
docsnap
,
err
:=
client
.
Doc
(
"States/Ohio"
).
Get
(
ctx
)
if
err
!=
nil
{
// TODO: Handle error.
}
pop
,
err
:=
docsnap
.
DataAtPath
([]
string
{
"capital"
,
"population"
})
if
err
!=
nil
{
// TODO: Handle error.
}
fmt
.
Println
(
pop
)
}
func (*DocumentSnapshot) DataTo
func
(
d
*
DocumentSnapshot
)
DataTo
(
p
interface
{})
error
DataTo uses the document's fields to populate p, which can be a pointer to a map[string]interface{} or a pointer to a struct.
Firestore field values are converted to Go values as follows:
- Null converts to nil.
- Bool converts to bool.
- String converts to string.
- Integer converts int64. When setting a struct field, any signed or unsigned integer type is permitted except uint, uint64 or uintptr. Overflow is detected and results in an error.
- Double converts to float64. When setting a struct field, float32 is permitted. Overflow is detected and results in an error.
- Bytes is converted to []byte.
- Timestamp converts to time.Time.
- GeoPoint converts to *latlng.LatLng, where latlng is the package "google.golang.org/genproto/googleapis/type/latlng".
- Arrays convert to []interface{}. When setting a struct field, the field may be a slice or array of any type and is populated recursively. Slices are resized to the incoming value's size, while arrays that are too long have excess elements filled with zero values. If the array is too short, excess incoming values will be dropped.
- Vectors convert to []float64
- Maps convert to map[string]interface{}. When setting a struct field, maps of key type string and any value type are permitted, and are populated recursively.
- References are converted to *firestore.DocumentRefs.
Field names given by struct field tags are observed, as described in DocumentRef.Create.
Only the fields actually present in the document are used to populate p. Other fields of p are left unchanged.
If the document does not exist, DataTo returns a NotFound error.
Example
package
main
import
(
"context"
"fmt"
"cloud.google.com/go/firestore"
)
func
main
()
{
ctx
:=
context
.
Background
()
client
,
err
:=
firestore
.
NewClient
(
ctx
,
"project-id"
)
if
err
!=
nil
{
// TODO: Handle error.
}
defer
client
.
Close
()
docsnap
,
err
:=
client
.
Doc
(
"States/Ohio"
).
Get
(
ctx
)
if
err
!=
nil
{
// TODO: Handle error.
}
type
State
struct
{
Capital
string
`firestore:"capital"`
Population
float64
`firestore:"pop"`
// in millions
}
var
s
State
if
err
:=
docsnap
.
DataTo
(
& s
);
err
!=
nil
{
// TODO: Handle error.
}
fmt
.
Println
(
s
)
}
func (*DocumentSnapshot) Exists
func
(
d
*
DocumentSnapshot
)
Exists
()
bool
Exists reports whether the DocumentSnapshot represents an existing document. Even if Exists returns false, the Ref and ReadTime fields of the DocumentSnapshot are valid.
DocumentSnapshotIterator
type
DocumentSnapshotIterator
struct
{
// contains filtered or unexported fields
}
DocumentSnapshotIterator is an iterator over snapshots of a document. Call Next on the iterator to get a snapshot of the document each time it changes. Call Stop on the iterator when done.
For an example, see DocumentRef.Snapshots.
func (*DocumentSnapshotIterator) Next
func
(
it
*
DocumentSnapshotIterator
)
Next
()
(
*
DocumentSnapshot
,
error
)
Next blocks until the document changes, then returns the DocumentSnapshot for the current state of the document. If the document has been deleted, Next returns a DocumentSnapshot whose Exists method returns false.
Next is not expected to return iterator.Done unless it is called after Stop. Rarely, networking issues may also cause iterator.Done to be returned.
func (*DocumentSnapshotIterator) Stop
func
(
it
*
DocumentSnapshotIterator
)
Stop
()
Stop stops receiving snapshots. You should always call Stop when you are done with a DocumentSnapshotIterator, to free up resources. It is not safe to call Stop concurrently with Next.
EntityFilter
type
EntityFilter
interface
{
// contains filtered or unexported methods
}
EntityFilter represents a Firestore filter.
FieldPath
type
FieldPath
[]
string
A FieldPath is a non-empty sequence of non-empty fields that reference a value.
A FieldPath value should only be necessary if one of the field names contains one of the runes ".˜*/[]". Most methods accept a simpler form of field path as a string in which the individual fields are separated by dots. For example,
[]string{"a", "b"}
is equivalent to the string form
"a.b"
but
[]string{"*"}
has no equivalent string form.
FindNearestOptions
type
FindNearestOptions
struct
{
}
FindNearestOptions are options for a FindNearest vector query. At present, there are no options.
OrFilter
type
OrFilter
struct
{
Filters
[]
EntityFilter
}
OrFilter represents a union of two or more filters.
Precondition
type
Precondition
interface
{
// contains filtered or unexported methods
}
A Precondition modifies a Firestore update or delete operation.
Exists
var
Exists
Precondition
Exists is a Precondition that checks for the existence of a resource before writing to it. If the check fails, the write does not occur.
func LastUpdateTime
func
LastUpdateTime
(
t
time
.
Time
)
Precondition
LastUpdateTime returns a Precondition that checks that a resource must exist and must have last been updated at the given time. If the check fails, the write does not occur.
PropertyFilter
PropertyFilter represents a filter on single property.
Path can be a single field or a dot-separated sequence of fields denoting property path, and must not contain any of the runes "˜*/[]". Operator must be one of "==", "!=", "<", "<=", ">", ">=", "array-contains", "array-contains-any", "in" or "not-in".
PropertyPathFilter
PropertyPathFilter represents a filter on single property.
Path can be an array of fields denoting property path. Operator must be one of "==", "!=", "<", "<=", ">", ">=", "array-contains", "array-contains-any", "in" or "not-in".
Query
type
Query
struct
{
// contains filtered or unexported fields
}
Query represents a Firestore query.
Query values are immutable. Each Query method creates a new Query; it does not modify the old.
func (Query) Deserialize
Deserialize takes a slice of bytes holding the wire-format message of RunQueryRequest, the underlying proto message used by Queries. It then populates and returns a Query object that can be used to execut that Query.
func (Query) Documents
func
(
q
Query
)
Documents
(
ctx
context
.
Context
)
*
DocumentIterator
Documents returns an iterator over the query's resulting documents.
Examples
package
main
import
(
"context"
"cloud.google.com/go/firestore"
)
func
main
()
{
ctx
:=
context
.
Background
()
client
,
err
:=
firestore
.
NewClient
(
ctx
,
"project-id"
)
if
err
!=
nil
{
// TODO: Handle error.
}
defer
client
.
Close
()
q
:=
client
.
Collection
(
"States"
).
Select
(
"pop"
).
Where
(
"pop"
,
">"
,
10
).
OrderBy
(
"pop"
,
firestore
.
Desc
).
Limit
(
10
)
iter1
:=
q
.
Documents
(
ctx
)
_
=
iter1
// TODO: Use iter1.
// You can call Documents directly on a CollectionRef as well.
iter2
:=
client
.
Collection
(
"States"
).
Documents
(
ctx
)
_
=
iter2
// TODO: Use iter2.
}
path_methods
package
main
import
(
"context"
"cloud.google.com/go/firestore"
)
func
main
()
{
ctx
:=
context
.
Background
()
client
,
err
:=
firestore
.
NewClient
(
ctx
,
"project-id"
)
if
err
!=
nil
{
// TODO: Handle error.
}
defer
client
.
Close
()
q
:=
client
.
Collection
(
"Unusual"
).
SelectPaths
([]
string
{
"*"
},
[]
string
{
"[~]"
}).
WherePath
([]
string
{
"/"
},
">"
,
10
).
OrderByPath
([]
string
{
"/"
},
firestore
.
Desc
).
Limit
(
10
)
iter1
:=
q
.
Documents
(
ctx
)
_
=
iter1
// TODO: Use iter1.
// You can call Documents directly on a CollectionRef as well.
iter2
:=
client
.
Collection
(
"States"
).
Documents
(
ctx
)
_
=
iter2
// TODO: Use iter2.
}
func (Query) EndAt
EndAt returns a new Query that specifies that results should end at the document with the given field values. See Query.StartAt for more information.
Calling EndAt overrides a previous call to EndAt or EndBefore.
func (Query) EndBefore
EndBefore returns a new Query that specifies that results should end just before the document with the given field values. See Query.StartAt for more information.
Calling EndBefore overrides a previous call to EndAt or EndBefore.
func (Query) FindNearest
func
(
q
Query
)
FindNearest
(
vectorField
string
,
queryVector
any
,
limit
int
,
measure
DistanceMeasure
,
options
*
FindNearestOptions
)
VectorQuery
FindNearest returns a query that can perform vector distance (similarity) search.
The returned query, when executed, performs a distance search on the specified vectorField against the given queryVector and returns the top documents that are closest to the queryVector according to measure. At most limit documents are returned.
Only documents whose vectorField field is a Vector32 or Vector64 of the same dimension as queryVector participate in the query; all other documents are ignored. In particular, fields of type []float32 or []float64 are ignored.
The vectorField argument can be a single field or a dot-separated sequence of fields, and must not contain any of the runes "˜*/[]".
The queryVector argument can be any of the following types:
- []float32
- []float64
- Vector32
- Vector64
Example
package
main
import
(
"context"
"cloud.google.com/go/firestore"
)
func
main
()
{
ctx
:=
context
.
Background
()
client
,
err
:=
firestore
.
NewClient
(
ctx
,
"project-id"
)
if
err
!=
nil
{
// TODO: Handle error.
}
defer
client
.
Close
()
//
q
:=
client
.
Collection
(
"descriptions"
).
FindNearest
(
"Embedding"
,
[]
float32
{
1
,
2
,
3
},
5
,
firestore
.
DistanceMeasureDotProduct
,
nil
)
iter1
:=
q
.
Documents
(
ctx
)
_
=
iter1
// TODO: Use iter1.
}
func (Query) FindNearestPath
func
(
q
Query
)
FindNearestPath
(
vectorFieldPath
FieldPath
,
queryVector
any
,
limit
int
,
measure
DistanceMeasure
,
options
*
FindNearestOptions
)
VectorQuery
FindNearestPath is like [Query.FindNearest] but it accepts a [FieldPath].
func (Query) Limit
Limit returns a new Query that specifies the maximum number of first results to return. It must not be negative.
func (Query) LimitToLast
LimitToLast returns a new Query that specifies the maximum number of last results to return. It must not be negative.
func (*Query) NewAggregationQuery
func
(
q
*
Query
)
NewAggregationQuery
()
*
AggregationQuery
NewAggregationQuery returns an AggregationQuery with this query as its base query.
func (Query) Offset
Offset returns a new Query that specifies the number of initial results to skip. It must not be negative.
func (Query) OrderBy
OrderBy returns a new Query that specifies the order in which results are returned. A Query can have multiple OrderBy/OrderByPath specifications. OrderBy appends the specification to the list of existing ones.
The path argument can be a single field or a dot-separated sequence of fields, and must not contain any of the runes "˜*/[]".
To order by document name, use the special field path DocumentID.
func (Query) OrderByPath
OrderByPath returns a new Query that specifies the order in which results are returned. A Query can have multiple OrderBy/OrderByPath specifications. OrderByPath appends the specification to the list of existing ones.
func (Query) Select
Select returns a new Query that specifies the paths to return from the result documents. Each path argument can be a single field or a dot-separated sequence of fields, and must not contain any of the runes "˜*/[]".
An empty Select call will produce a query that returns only document IDs.
func (Query) SelectPaths
SelectPaths returns a new Query that specifies the field paths to return from the result documents.
An empty SelectPaths call will produce a query that returns only document IDs.
func (Query) Serialize
Serialize creates a RunQueryRequest wire-format byte slice from a Query object. This can be used in combination with Deserialize to marshal Query objects. This could be useful, for instance, if executing a query formed in one process in another.
func (Query) Snapshots
func
(
q
Query
)
Snapshots
(
ctx
context
.
Context
)
*
QuerySnapshotIterator
Snapshots returns an iterator over snapshots of the query. Each time the query results change, a new snapshot will be generated.
Example
package
main
import
(
"context"
"fmt"
"cloud.google.com/go/firestore"
"google.golang.org/api/iterator"
)
func
main
()
{
ctx
:=
context
.
Background
()
client
,
err
:=
firestore
.
NewClient
(
ctx
,
"project-id"
)
if
err
!=
nil
{
// TODO: Handle error.
}
defer
client
.
Close
()
q
:=
client
.
Collection
(
"States"
).
Where
(
"pop"
,
">"
,
10
).
OrderBy
(
"pop"
,
firestore
.
Desc
).
Limit
(
10
)
qsnapIter
:=
q
.
Snapshots
(
ctx
)
// Listen forever for changes to the query's results.
for
{
qsnap
,
err
:=
qsnapIter
.
Next
()
if
err
==
iterator
.
Done
{
break
}
if
err
!=
nil
{
// TODO: Handle error.
}
fmt
.
Printf
(
"At %s there were %d results.\n"
,
qsnap
.
ReadTime
,
qsnap
.
Size
)
_
=
qsnap
.
Documents
// TODO: Iterate over the results if desired.
_
=
qsnap
.
Changes
// TODO: Use the list of incremental changes if desired.
}
}
func (Query) StartAfter
StartAfter returns a new Query that specifies that results should start just after the document with the given field values. See Query.StartAt for more information.
Calling StartAfter overrides a previous call to StartAt or StartAfter.
func (Query) StartAt
StartAt returns a new Query that specifies that results should start at the document with the given field values.
StartAt may be called with a single DocumentSnapshot, representing an existing document within the query. The document must be a direct child of the location being queried (not a parent document, or document in a different collection, or a grandchild document, for example).
Otherwise, StartAt should be called with one field value for each OrderBy clause, in the order that they appear. For example, in
q.OrderBy("X", Asc).OrderBy("Y", Desc).StartAt(1, 2)
results will begin at the first document where X = 1 and Y = 2.
If an OrderBy call uses the special DocumentID field path, the corresponding value should be the document ID relative to the query's collection. For example, to start at the document "NewYork" in the "States" collection, write
client.Collection("States").OrderBy(DocumentID, firestore.Asc).StartAt("NewYork")
Calling StartAt overrides a previous call to StartAt or StartAfter.
func (Query) Where
Where returns a new Query that filters the set of results. A Query can have multiple filters. The path argument can be a single field or a dot-separated sequence of fields, and must not contain any of the runes "˜*/[]". The op argument must be one of "==", "!=", "<", "<=", ">", ">=", "array-contains", "array-contains-any", "in" or "not-in". WARNING: Using WhereEntity with Simple and Composite filters is recommended.
func (Query) WhereEntity
func
(
q
Query
)
WhereEntity
(
ef
EntityFilter
)
Query
WhereEntity returns a query with provided filter.
EntityFilter can be a simple filter or a composite filter PropertyFilter and PropertyPathFilter are supported simple filters AndFilter and OrFilter are supported composite filters Entity filters in multiple calls are joined together by AND
func (Query) WherePath
WherePath returns a new Query that filters the set of results. A Query can have multiple filters. The op argument must be one of "==", "!=", "<", "<=", ">", ">=", "array-contains", "array-contains-any", "in" or "not-in". WARNING: Using WhereEntity with Simple and Composite filters is recommended.
func (*Query) WithReadOptions
func
(
q
*
Query
)
WithReadOptions
(
opts
...
ReadOption
)
*
Query
WithReadOptions specifies constraints for accessing documents from the database, e.g. at what time snapshot to read the documents.
QuerySnapshot
type
QuerySnapshot
struct
{
// An iterator over the query results.
// It is not necessary to call Stop on this iterator.
Documents
*
DocumentIterator
// The number of results in this snapshot.
Size
int
// The changes since the previous snapshot.
Changes
[]
DocumentChange
// The time at which this snapshot was obtained from Firestore.
ReadTime
time
.
Time
}
A QuerySnapshot is a snapshot of query results. It is returned by QuerySnapshotIterator.Next whenever the results of a query change.
QuerySnapshotIterator
type
QuerySnapshotIterator
struct
{
// The Query used to construct this iterator.
Query
Query
// contains filtered or unexported fields
}
QuerySnapshotIterator is an iterator over snapshots of a query. Call Next on the iterator to get a snapshot of the query's results each time they change. Call Stop on the iterator when done.
For an example, see Query.Snapshots.
func (*QuerySnapshotIterator) Next
func
(
it
*
QuerySnapshotIterator
)
Next
()
(
*
QuerySnapshot
,
error
)
Next blocks until the query's results change, then returns a QuerySnapshot for the current results.
Next is not expected to return iterator.Done unless it is called after Stop. Rarely, networking issues may also cause iterator.Done to be returned.
func (*QuerySnapshotIterator) Stop
func
(
it
*
QuerySnapshotIterator
)
Stop
()
Stop stops receiving snapshots. You should always call Stop when you are done with a QuerySnapshotIterator, to free up resources. It is not safe to call Stop concurrently with Next.
Queryer
type
Queryer
interface
{
// contains filtered or unexported methods
}
A Queryer is a Query or a CollectionRef. CollectionRefs act as queries whose results are all the documents in the collection.
ReadOption
type
ReadOption
interface
{
// contains filtered or unexported methods
}
ReadOption interface allows for abstraction of computing read time settings.
func ReadTime
func
ReadTime
(
t
time
.
Time
)
ReadOption
ReadTime specifies a time-specific snapshot of the database to read.
SetOption
type
SetOption
interface
{
// contains filtered or unexported methods
}
A SetOption modifies a Firestore set operation.
MergeAll
var
MergeAll
SetOption
=
merge
{
/* contains filtered or unexported fields */
}
MergeAll is a SetOption that causes all the field paths given in the data argument to Set to be overwritten. It is not supported for struct data.
func Merge
Merge returns a SetOption that causes only the given field paths to be overwritten. Other fields on the existing document will be untouched. It is an error if a provided field path does not refer to a value in the data passed to Set.
SimpleFilter
type
SimpleFilter
interface
{
EntityFilter
// contains filtered or unexported methods
}
SimpleFilter represents a simple Firestore filter.
Transaction
type
Transaction
struct
{
// contains filtered or unexported fields
}
Transaction represents a Firestore transaction.
func (*Transaction) Create
func
(
t
*
Transaction
)
Create
(
dr
*
DocumentRef
,
data
interface
{})
error
Create adds a Create operation to the Transaction. See DocumentRef.Create for details.
func (*Transaction) Delete
func
(
t
*
Transaction
)
Delete
(
dr
*
DocumentRef
,
opts
...
Precondition
)
error
Delete adds a Delete operation to the Transaction. See DocumentRef.Delete for details.
func (*Transaction) DocumentRefs
func
(
t
*
Transaction
)
DocumentRefs
(
cr
*
CollectionRef
)
*
DocumentRefIterator
DocumentRefs returns references to all the documents in the collection, including missing documents. A missing document is a document that does not exist but has sub-documents.
func (*Transaction) Documents
func
(
t
*
Transaction
)
Documents
(
q
Queryer
)
*
DocumentIterator
Documents returns a DocumentIterator based on given Query or CollectionRef. The results will be in the context of the transaction.
func (*Transaction) Get
func
(
t
*
Transaction
)
Get
(
dr
*
DocumentRef
)
(
*
DocumentSnapshot
,
error
)
Get gets the document in the context of the transaction. The transaction holds a pessimistic lock on the returned document. If the document does not exist, Get returns a NotFound error, which can be checked with
status.Code(err) == codes.NotFound
func (*Transaction) GetAll
func
(
t
*
Transaction
)
GetAll
(
drs
[]
*
DocumentRef
)
([]
*
DocumentSnapshot
,
error
)
GetAll retrieves multiple documents with a single call. The DocumentSnapshots are returned in the order of the given DocumentRefs. If a document is not present, the corresponding DocumentSnapshot's Exists method will return false. The transaction holds a pessimistic lock on all of the returned documents.
func (*Transaction) Set
func
(
t
*
Transaction
)
Set
(
dr
*
DocumentRef
,
data
interface
{},
opts
...
SetOption
)
error
Set adds a Set operation to the Transaction. See DocumentRef.Set for details.
func (*Transaction) Update
func
(
t
*
Transaction
)
Update
(
dr
*
DocumentRef
,
data
[]
Update
,
opts
...
Precondition
)
error
Update adds a new Update operation to the Transaction. See DocumentRef.Update for details.
func (*Transaction) WithReadOptions
func
(
t
*
Transaction
)
WithReadOptions
(
opts
...
ReadOption
)
*
Transaction
WithReadOptions specifies constraints for accessing documents from the database, e.g. at what time snapshot to read the documents.
TransactionOption
type
TransactionOption
interface
{
// contains filtered or unexported methods
}
A TransactionOption is an option passed to Client.Transaction.
Update
type
Update
struct
{
Path
string
// Will be split on dots, and must not contain any of "˜*/[]".
FieldPath
FieldPath
Value
interface
{}
}
An Update describes an update to a value referred to by a path. An Update should have either a non-empty Path or a non-empty FieldPath, but not both.
See DocumentRef.Create for acceptable values. To delete a field, specify firestore.Delete as the value.
Vector32
type
Vector32
[]
float32
Vector32 is an embedding vector of float32s.
Vector64
type
Vector64
[]
float64
Vector64 is an embedding vector of float64s.
VectorQuery
type
VectorQuery
struct
{
// contains filtered or unexported fields
}
VectorQuery represents a query that uses [Query.FindNearest] or [Query.FindNearestPath].
func (VectorQuery) Documents
func
(
vq
VectorQuery
)
Documents
(
ctx
context
.
Context
)
*
DocumentIterator
Documents returns an iterator over the vector query's resulting documents.
WriteBatch (deprecated)
type
WriteBatch
struct
{
// contains filtered or unexported fields
}
A WriteBatch holds multiple database updates. Build a batch with the Create, Set, Update and Delete methods, then run it with the Commit method. Errors in Create, Set, Update or Delete are recorded instead of being returned immediately. The first such error is returned by Commit.
Deprecated: The WriteBatch API has been replaced with the transaction and
the bulk writer API. For atomic transaction operations, use Transaction
.
For bulk read and write operations, use BulkWriter
.
func (*WriteBatch) Commit (deprecated)
func
(
b
*
WriteBatch
)
Commit
(
ctx
context
.
Context
)
(
_
[]
*
WriteResult
,
err
error
)
Commit applies all the writes in the batch to the database atomically. Commit returns an error if there are no writes in the batch, if any errors occurred in constructing the writes, or if the Commmit operation fails.
Example
package
main
import
(
"context"
"fmt"
"cloud.google.com/go/firestore"
)
func
main
()
{
ctx
:=
context
.
Background
()
client
,
err
:=
firestore
.
NewClient
(
ctx
,
"project-id"
)
if
err
!=
nil
{
// TODO: Handle error.
}
defer
client
.
Close
()
type
State
struct
{
Capital
string
`firestore:"capital"`
Population
float64
`firestore:"pop"`
// in millions
}
ny
:=
client
.
Doc
(
"States/NewYork"
)
ca
:=
client
.
Doc
(
"States/California"
)
writeResults
,
err
:=
client
.
Batch
().
Create
(
ny
,
State
{
Capital
:
"Albany"
,
Population
:
19.8
}).
Set
(
ca
,
State
{
Capital
:
"Sacramento"
,
Population
:
39.14
}).
Delete
(
client
.
Doc
(
"States/WestDakota"
)).
Commit
(
ctx
)
if
err
!=
nil
{
// TODO: Handle error.
}
fmt
.
Println
(
writeResults
)
}
func (*WriteBatch) Create (deprecated)
func
(
b
*
WriteBatch
)
Create
(
dr
*
DocumentRef
,
data
interface
{})
*
WriteBatch
Create adds a Create operation to the batch. See DocumentRef.Create for details.
func (*WriteBatch) Delete (deprecated)
func
(
b
*
WriteBatch
)
Delete
(
dr
*
DocumentRef
,
opts
...
Precondition
)
*
WriteBatch
Delete adds a Delete operation to the batch. See DocumentRef.Delete for details.
func (*WriteBatch) Set (deprecated)
func
(
b
*
WriteBatch
)
Set
(
dr
*
DocumentRef
,
data
interface
{},
opts
...
SetOption
)
*
WriteBatch
Set adds a Set operation to the batch. See DocumentRef.Set for details.
func (*WriteBatch) Update (deprecated)
func
(
b
*
WriteBatch
)
Update
(
dr
*
DocumentRef
,
data
[]
Update
,
opts
...
Precondition
)
*
WriteBatch
Update adds an Update operation to the batch. See DocumentRef.Update for details.
WriteResult
type
WriteResult
struct
{
// The time at which the document was updated, or created if it did not
// previously exist. Writes that do not actually change the document do
// not change the update time.
UpdateTime
time
.
Time
}
A WriteResult is returned by methods that write documents.
