Class WriteBatch (1.9.1)

Version 1.9.1

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WriteBatch(client)

Accumulate write operations to be sent in a batch.

This has the same set of methods for write operations that xref_DocumentReference does, e.g. xref_create.

Parameter

Name	Description
client	Client The client that created this batch.

Inheritance

builtins.object > WriteBatch

Methods

commit

commit()

Commit the changes accumulated in this batch.

Returns

Type	Description
List[WriteResult, ...]	The write results corresponding to the changes committed, returned in the same order as the changes were applied to this batch. A write result contains an ``update_time`` field.

create

create(reference, document_data)

Add a "change" to this batch to create a document.

If the document given by reference already exists, then this batch will fail when commit-ed.

Parameters

Name	Description
reference	DocumentReference A document reference to be created in this batch.
document_data	dict Property names and values to use for creating a document.

delete

delete(reference, option=None)

Add a "change" to delete a document.

See xref_delete for more information on how option determines how the change is applied.

Parameters

Name	Description
reference	DocumentReference A document reference that will be deleted in this batch.
option	Optional[WriteOption] A write option to make assertions / preconditions on the server state of the document before applying changes.

set

set(reference, document_data, merge=False)

Add a "change" to replace a document.

See xref_set for more information on how option determines how the change is applied.

Parameters

Name	Description
reference	DocumentReference A document reference that will have values set in this batch.
document_data	dict Property names and values to use for replacing a document.
merge	Optional[bool] or Optional[List If True, apply merging instead of overwriting the state of the document.

update

update(reference, field_updates, option=None)

Add a "change" to update a document.

See xref_update for more information on field_updates and option.

Parameters

Name	Description
reference	DocumentReference A document reference that will be updated in this batch.
field_updates	dict Field names or paths to update and values to update with.
option	Optional[WriteOption] A write option to make assertions / preconditions on the server state of the document before applying changes.