Class DocumentReference (3.9.3)

Version 3.9.3

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• 3.27.2
• 3.26.5
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public class DocumentReference

A DocumentReference refers to a document location in a Firestore database and can be used to write, read, or listen to the location. There may or may not exist a document at the referenced location. A DocumentReference can also be used to create a CollectionReference to a subcollection.

Subclassing Note: Firestore classes are not meant to be subclassed except for use in test mocks. Subclassing is not supported in production code and new SDK releases may break code that does so.

Inheritance

Object > DocumentReference

Inherited Members

Object.clone()

Object.equals(Object)

Object.finalize()

Object.getClass()

Object.hashCode()

Object.notify()

Object.notifyAll()

Object.toString()

Object.wait()

Object.wait(long)

Object.wait(long,int)

Methods

addSnapshotListener(EventListener<DocumentSnapshot> listener)

public ListenerRegistration addSnapshotListener(EventListener<DocumentSnapshot> listener)

Starts listening to the document referenced by this DocumentReference.

Parameter
Name	Description
listener	EventListener<DocumentSnapshot> The event listener that will be called with the snapshots.

Returns
Type	Description
ListenerRegistration	A registration object that can be used to remove the listener.

addSnapshotListener(Executor executor, EventListener<DocumentSnapshot> listener)

public ListenerRegistration addSnapshotListener(Executor executor, EventListener<DocumentSnapshot> listener)

Starts listening to the document referenced by this DocumentReference.

Parameters
Name	Description
executor	Executor The executor to use to call the listener.
listener	EventListener<DocumentSnapshot> The event listener that will be called with the snapshots.

Returns
Type	Description
ListenerRegistration	A registration object that can be used to remove the listener.

collection(String collectionPath)

public CollectionReference collection(String collectionPath)

Gets a CollectionReference instance that refers to the collection that is a child of this document.

Parameter
Name	Description
collectionPath	String A relative and slash-separated path to a collection.

Returns
Type	Description
CollectionReference	The CollectionReference instance.

create(Object pojo)

public ApiFuture<WriteResult> create(Object pojo)

Creates a new Document at the DocumentReference location. It fails the write if the document exists.

Parameter
Name	Description
pojo	Object The POJO that will be used to populate the document contents.

Returns
Type	Description
ApiFuture<WriteResult>	An ApiFuture that will be resolved when the write finishes.

create(Map<String,Object> fields)

public ApiFuture<WriteResult> create(Map<String,Object> fields)

Creates a new Document at the DocumentReference's Location. It fails the write if the document exists.

Parameter
Name	Description
fields	Map<String,Object> A map of the fields and values for the document.

Returns
Type	Description
ApiFuture<WriteResult>	An ApiFuture that will be resolved when the write finishes.

delete()

public ApiFuture<WriteResult> delete()

Deletes the document referred to by this DocumentReference.

Returns
Type	Description
ApiFuture<WriteResult>	An ApiFuture that will be resolved when the delete completes.

delete(Precondition options)

public ApiFuture<WriteResult> delete(Precondition options)

Deletes the document referred to by this DocumentReference.

Parameter
Name	Description
options	Precondition Preconditions to enforce for this delete.

Returns
Type	Description
ApiFuture<WriteResult>	An ApiFuture that will be resolved when the delete completes.

equals(Object obj)

public boolean equals(Object obj)

Returns true if this DocumentReference is equal to the provided object.

Parameter
Name	Description
obj	Object The object to compare against.

Returns
Type	Description
boolean	Whether this DocumentReference is equal to the provided object.

Overrides

Object.equals(Object)

get()

public ApiFuture<DocumentSnapshot> get()

Reads the document referenced by this DocumentReference. If the document doesn't exist, the get() will return an an empty DocumentSnapshot.

Returns
Type	Description
ApiFuture<DocumentSnapshot>	An ApiFuture that will be resolved with the contents of the Document at this DocumentReference, or a failure if the document does not exist.

get(FieldMask fieldMask)

public ApiFuture<DocumentSnapshot> get(FieldMask fieldMask)

Reads the document referenced by this DocumentReference. If the document doesn't exist, the get(FieldMask fieldMask) will return an empty DocumentSnapshot.

Parameter
Name	Description
fieldMask	FieldMask A FieldMask object to retrieve the field value

Returns
Type	Description
ApiFuture<DocumentSnapshot>	An ApiFuture that will be resolved with the contents of the Document at this DocumentReference, or a failure if the document does not exist

getFirestore()

public Firestore getFirestore()

Returns
Type	Description
Firestore

getId()

public String getId()

The id of a document refers to the last component of path pointing to a document, e.g. "document-id" in "projects/project-id/databases/database-id/document-id".

Returns
Type	Description
String	The ID of the document.

getParent()

public CollectionReference getParent()

A reference to the Collection to which this DocumentReference belongs to.

Returns
Type	Description
CollectionReference	The parent Collection.

getPath()

public String getPath()

A string representing the path of the referenced document (relative to the root of the database).

Returns
Type	Description
String	The slash-separated path relative to the root of the database.

hashCode()

public int hashCode()

Returns
Type	Description
int

Overrides

Object.hashCode()

listCollections()

public Iterable<CollectionReference> listCollections()

Fetches the subcollections that are direct children of this document.

Returns
Type	Description
Iterable<CollectionReference>	An Iterable that can be used to fetch all subcollections.

set(Object pojo)

public ApiFuture<WriteResult> set(Object pojo)

Overwrites the document referred to by this DocumentReference. If no document exists yet, it will be created. If a document already exists, it will be overwritten.

Parameter
Name	Description
pojo	Object The POJO that will be used to populate the document contents.

Returns
Type	Description
ApiFuture<WriteResult>	An ApiFuture that will be resolved when the write finishes.

set(Object pojo, SetOptions options)

public ApiFuture<WriteResult> set(Object pojo, SetOptions options)

Writes to the document referred to by this DocumentReference. If the document does not yet exist, it will be created. If you pass SetOptions, the provided data can be merged into an existing document.

Parameters
Name	Description
pojo	Object The POJO that will be used to populate the document contents.
options	SetOptions An object to configure the set behavior.

Returns
Type	Description
ApiFuture<WriteResult>	An ApiFuture that will be resolved when the write finishes.

set(Map<String,Object> fields)

public ApiFuture<WriteResult> set(Map<String,Object> fields)

Overwrites the document referred to by this DocumentReference. If no document exists yet, it will be created. If a document already exists, it will be overwritten.

Parameter
Name	Description
fields	Map<String,Object> A map of the fields and values for the document.

Returns
Type	Description
ApiFuture<WriteResult>	An ApiFuture that will be resolved when the write finishes.

set(Map<String,Object> fields, SetOptions options)

public ApiFuture<WriteResult> set(Map<String,Object> fields, SetOptions options)

Writes to the document referred to by this DocumentReference. If the document does not yet exist, it will be created. If you pass SetOptions, the provided data can be merged into an existing document.

Parameters
Name	Description
fields	Map<String,Object> A map of the fields and values for the document.
options	SetOptions An object to configure the set behavior.

Returns
Type	Description
ApiFuture<WriteResult>	An ApiFuture that will be resolved when the write finishes.

toString()

public String toString()

Returns
Type	Description
String

Overrides

Object.toString()

update(FieldPath fieldPath, Object value, Object[] moreFieldsAndValues)

public ApiFuture<WriteResult> update(FieldPath fieldPath, Object value, Object[] moreFieldsAndValues)

Updates the fields in the document referred to by this DocumentReference. If the document doesn't exist yet, the update will fail.

Parameters
Name	Description
fieldPath	FieldPath The first field to set
value	Object The first value to set
moreFieldsAndValues	Object[] String and Object pairs with more fields to be set.

Returns
Type	Description
ApiFuture<WriteResult>	A ApiFuture that will be resolved when the write finishes.

update(Precondition options, FieldPath fieldPath, Object value, Object[] moreFieldsAndValues)

public ApiFuture<WriteResult> update(Precondition options, FieldPath fieldPath, Object value, Object[] moreFieldsAndValues)

Updates the fields in the document referred to by this DocumentReference. If the document doesn't exist yet, the update will fail.

Parameters
Name	Description
options	Precondition Preconditions to enforce on this update.
fieldPath	FieldPath The first field to set
value	Object The first value to set
moreFieldsAndValues	Object[] String and Object pairs with more fields to be set.

Returns
Type	Description
ApiFuture<WriteResult>	A ApiFuture that will be resolved when the write finishes.

update(Precondition options, String field, Object value, Object[] moreFieldsAndValues)

public ApiFuture<WriteResult> update(Precondition options, String field, Object value, Object[] moreFieldsAndValues)

Updates the fields in the document referred to by this DocumentReference. If the document doesn't exist yet, the update will fail.

Parameters
Name	Description
options	Precondition Preconditions to enforce on this update.
field	String The first field to set
value	Object The first value to set
moreFieldsAndValues	Object[] String and Object pairs with more fields to be set.

Returns
Type	Description
ApiFuture<WriteResult>	A ApiFuture that will be resolved when the write finishes.

update(String field, Object value, Object[] moreFieldsAndValues)

public ApiFuture<WriteResult> update(String field, Object value, Object[] moreFieldsAndValues)

Updates the fields in the document referred to by this DocumentReference. If the document doesn't exist yet, the update will fail.

Parameters
Name	Description
field	String The first field to set
value	Object The first value to set
moreFieldsAndValues	Object[] String and Object pairs with more fields to be set.

Returns
Type	Description
ApiFuture<WriteResult>	An ApiFuture that will be resolved when the write finishes.

update(Map<String,Object> fields)

public ApiFuture<WriteResult> update(Map<String,Object> fields)

Updates fields in the document referred to by this DocumentReference. If the document doesn't exist yet, the update will fail.

Parameter
Name	Description
fields	Map<String,Object> A Map containing the fields and values with which to update the document.

Returns
Type	Description
ApiFuture<WriteResult>	An ApiFuture that will be resolved when the write finishes.

update(Map<String,Object> fields, Precondition options)

public ApiFuture<WriteResult> update(Map<String,Object> fields, Precondition options)

Updates fields in the document referred to by this DocumentReference. If the document doesn't exist yet, the update will fail.

Parameters
Name	Description
fields	Map<String,Object> A map containing the fields and values with which to update the document.
options	Precondition Preconditions to enforce on this update.

Returns
Type	Description
ApiFuture<WriteResult>	An ApiFuture that will be resolved when the write finishes.