Cloud Firestore Client - Class DocumentSnapshot (1.40.0)

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

Represents the data of a document at the time of retrieval.

A snapshot is immutable and may point to a non-existing document.

Fields may be read in array-style syntax. Note that writing using array-style syntax is NOT supported and will result in a \BadMethodCallException.

Example:

use Google\Cloud\Firestore\FirestoreClient;

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

// Fields are exposed via array-style accessors:
$bitcoinWalletValue = $snapshot['wallet']['cryptoCurrency']['bitcoin'];

Get the reference of the document which created the snapshot.

Example:

$reference = $snapshot->reference();

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

Example:

$name = $snapshot->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\DocumentSnapshot::id().

Example:

$path = $snapshot->path();

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

IDs are the path element which identifies a resource. To retrieve the full path to a resource (the resource name), use Google\Cloud\Firestore\DocumentSnapshot::name().

Example:

$id = $snapshot->id();

Get the Document Update Timestamp.

Example:

$updateTime = $snapshot->updateTime();

Get the Document Read Timestamp.

Example:

$readTime = $snapshot->readTime();

Get the Document Create Timestamp.

Example:

$createTime = $snapshot->createTime();

Returns document data as an array, or null if the document does not exist.

Example:

$data = $snapshot->data();

Returns true if the document exists in the database.

Example:

if ($snapshot->exists()) {
    echo "The document exists!";
}

Get a field by field path.

A field path is a string containing the path to a specific field, at the top level or nested, delimited by .. For instance, the value hello in the structured field { "foo" : { "bar" : "hello" }} would be accessible using a field path of foo.bar.

Example:

$value = $snapshot->get('wallet.cryptoCurrency.bitcoin');

// Field names containing dots or symbols can be targeted using a FieldPath instance:
use Google\Cloud\Firestore\FieldPath;

$value = $snapshot->get(new FieldPath(['wallet', 'cryptoCurrency', 'my.coin']));