Cloud Firestore Client - Class DocumentReference (1.34.0)

Reference documentation and code samples for the Cloud Firestore Client class DocumentReference.

Represents a reference to a Firestore document.

Example:

 use Google\Cloud\Firestore\FirestoreClient;

$firestore = new FirestoreClient();
$document = $firestore->document('users/john'); 

Returns the parent collection.

Example:

 $parent = $document->parent(); 

Get the document name.

Names are absolute. The result of this call would be of the form projects/<project-id>/databases/<database-id>/documents/<relative-path> .

Other methods are available to retrieve different parts of a collection name:

• Google\Cloud\Firestore\Google\Cloud\Firestore\DocumentReference::id() Returns the last element.
• Google\Cloud\Firestore\Google\Cloud\Firestore\DocumentReference::path() Returns the path, relative to the database.

Example:

 $name = $document->name(); 

Get the document path.

Paths identify the location of a document, relative to the database name.

To retrieve the document ID (the last element of the path), use Google\Cloud\Firestore\Google\Cloud\Firestore\DocumentReference::id() .

Example:

 $path = $document->path(); 

Get the document identifier (i.e. the last path element).

IDs are the path element which identifies a resource. To retrieve the path of a resource, relative to the database name, use Google\Cloud\Firestore\Google\Cloud\Firestore\DocumentReference::path() .

Example:

 $id = $document->id(); 

Create a new document in Firestore.

If the document already exists, this method will fail.

Example:

 $document->create([
    'name' => 'John',
    'country' => 'USA'
]); 

Write to a Firestore document, with optional merge behavior.

This method will create the document if it does not already exist.

Unless $options.merge is set to true, this method will replace all existing document data.

Example:

 $document->set([
    'name' => 'Dave'
]); 

Update a Firestore document using field paths and values.

Merges provided data with data stored in Firestore.

Calling this method on a non-existent document will raise an exception.

This method supports various sentinel values, to perform special operations on fields. Available sentinel values are provided as methods, found in Google\Cloud\Firestore\Google\Cloud\Firestore\FieldValue .

Note that field names must be provided using field paths, encoded either as a dot-delimited string (i.e. foo.bar ), or an instance of Google\Cloud\Firestore\Google\Cloud\Firestore\FieldPath . Nested arrays are not allowed.

Please note that conflicting paths will result in an exception. Paths conflict when one path indicates a location nested within another path. For instance, path a.b cannot be set directly if path a is also provided.

Example:

 $document->update([
    ['path' => 'name', 'value' => 'John'],
    ['path' => 'country', 'value' => 'USA'],
    ['path' => 'cryptoCurrencies.bitcoin', 'value' => 0.5],
    ['path' => 'cryptoCurrencies.ethereum', 'value' => 10],
    ['path' => 'cryptoCurrencies.litecoin', 'value' => 5.51]
]); 

 // Google Cloud PHP provides special field values to enable operations such
// as deleting fields or setting the value to the current server timestamp.
use Google\Cloud\Firestore\FieldValue;

$document->update([
    ['path' => 'country', 'value' => FieldValue::deleteField()],
    ['path' => 'lastLogin', 'value' => FieldValue::serverTimestamp()]
]); 

 // If your field names contain special characters (such as `.`, or symbols),
// using <xref uid="\Google\Cloud\Firestore\Google\Cloud\Firestore\FieldPath">Google\Cloud\Firestore\Google\Cloud\Firestore\FieldPath</xref> will properly escape each element.

use Google\Cloud\Firestore\FieldPath;

$document->update([
    ['path' => new FieldPath(['cryptoCurrencies', 'big$$$coin']), 'value' => 5.51]
]); 

Delete a Firestore document.

Example:

 $document->delete(); 

Get a read-only snapshot of the document.

Example:

 $snapshot = $document->snapshot(); 

Get a reference to a collection which is a child of the current document.

Example:

 $child = $document->collection('wallet'); 

List all collections which are children of the current document.

Example:

 $collections = $document->collections();