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FirebaseFirestore Framework Reference

DocumentSnapshot

class DocumentSnapshot : NSObject, @unchecked Sendable

A DocumentSnapshot contains data read from a document in your Firestore database. The data can be extracted with the data property or by using subscript syntax to access a specific field.

For a DocumentSnapshot that points to a non-existing document, any data access will return nil. You can use the exists property to explicitly verify a documents existence.

  • True if the document exists.

    Declaration

    Swift

    var exists: Bool { get }

  • A DocumentReference to the document location.

    Declaration

    Swift

    var reference: FIRDocumentReference { get }

  • The ID of the document for which this DocumentSnapshot contains data.

    Declaration

    Swift

    var documentID: String { get }

  • Metadata about this snapshot concerning its source and if it has local modifications.

    Declaration

    Swift

    var metadata: FIRSnapshotMetadata { get }

  • Retrieves all fields in the document as a Dictionary. Returns nil if the document doesn’t exist.

    Server-provided timestamps that have not yet been set to their final value will be returned as NSNull. You can use the data(with:) method to configure this behavior.

    Declaration

    Swift

    func data() -> [String : Any]?

    Return Value

    A Dictionary containing all fields in the document or nil if the document doesn’t exist.

  • Retrieves all fields in the document as a Dictionary. Returns nil if the document doesn’t exist.

    Declaration

    Swift

    func data(with serverTimestampBehavior: ServerTimestampBehavior) -> [String : Any]?

    Parameters

    serverTimestampBehavior

    Configures how server timestamps that have not yet been set to their final value are returned from the snapshot.

    Return Value

    A Dictionary containing all fields in the document or nil if the document doesn’t exist.

  • Retrieves a specific field from the document. Returns nil if the document or the field doesn’t exist.

    The timestamps that have not yet been set to their final value will be returned as NSNull. You can use get(_:serverTimestampBehavior:) to configure this behavior.

    Declaration

    Swift

    func get(_ field: Any) -> Any?

    Parameters

    field

    The field to retrieve.

    Return Value

    The value contained in the field or nil if the document or field doesn’t exist.

  • Retrieves a specific field from the document. Returns nil if the document or the field doesn’t exist.

    The timestamps that have not yet been set to their final value will be returned as NSNull. You can use get(_:serverTimestampBehavior:) to configure this behavior.

    Declaration

    Swift

    func get(_ field: Any, serverTimestampBehavior: ServerTimestampBehavior) -> Any?

    Parameters

    field

    The field to retrieve.
    serverTimestampBehavior

    Configures how server timestamps that have not yet been set to their final value are returned from the snapshot.

    Return Value

    The value contained in the field or nil if the document or field doesn’t exist.

  • Retrieves a specific field from the document.

    Declaration

    Swift

    subscript(key: Any) -> Any? { get }

    Parameters

    key

    The field to retrieve.

    Return Value

    The value contained in the field or nil if the document or field doesn’t exist.

  • Retrieves all fields in a document and converts them to an instance of caller-specified type.

    By default, server-provided timestamps that have not yet been set to their final value will be returned as NSNull. Pass serverTimestampBehavior to configure this behavior.

    See Firestore.Decoder for more details about the decoding process.

    Declaration

    Swift

    func data<T: Decodable>(as type: T.Type,
                        with serverTimestampBehavior: ServerTimestampBehavior = .none,
                        decoder: Firestore.Decoder = .init()) throws -> T