Class AsyncTransaction (2.8.0) 

AsyncTransaction(client, max_attempts=5, read_only=False)

Accumulate read-and-write operations to be sent in a transaction.

Parameters
Name Description
client Client

The client that created this transaction.
max_attempts Optional[int]

The maximum number of attempts for the transaction (i.e. allowing retries). Defaults to MAX_ATTEMPTS.
read_only Optional[bool]

Flag indicating if the transaction should be read-only or should allow writes. Defaults to :data:False.

Properties

id

Get the current transaction ID.

Returns
Type Description
Optional[bytes] The transaction ID (or :data:None if the current transaction is not in progress).

in_progress

Determine if this transaction has already begun.

Returns
Type Description
bool Indicates if the transaction has started.

Methods

commit

commit(retry: google.api_core.retry.Retry = <_MethodDefault._DEFAULT_VALUE: <object object>>, timeout: Optional[float] = None)

Commit the changes accumulated in this batch.

Parameters
Name Description
retry google.api_core.retry.Retry

Designation of what errors, if any, should be retried. Defaults to a system-specified policy.
timeout float

The timeout for this request. Defaults to a system-specified value.
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: google.cloud.firestore_v1.base_document.BaseDocumentReference,
    document_data: dict,
)

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: google.cloud.firestore_v1.base_document.BaseDocumentReference,
    option: Optional[google.cloud.firestore_v1._helpers.WriteOption] = 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.

get

get(ref_or_query, retry: google.api_core.retry.Retry = <_MethodDefault._DEFAULT_VALUE: <object object>>, timeout: Optional[float] = None)

Retrieve a document or a query result from the database.

Parameters
Name Description
retry google.api_core.retry.Retry

Designation of what errors, if any, should be retried. Defaults to a system-specified policy.
timeout float :Yields: *.DocumentSnapshot* -- The next document snapshot that fulfills the query, or :data:None if the document does not exist.

The timeout for this request. Defaults to a system-specified value.

get_all

get_all(references: list, retry: google.api_core.retry.Retry = <_MethodDefault._DEFAULT_VALUE: <object object>>, timeout: Optional[float] = None)

Retrieves multiple documents from Firestore.

Parameters
Name Description
references List[.AsyncDocumentReference, ...]

Iterable of document references to be retrieved.
retry google.api_core.retry.Retry

Designation of what errors, if any, should be retried. Defaults to a system-specified policy.
timeout float :Yields: *.DocumentSnapshot* -- The next document snapshot that fulfills the query, or :data:None if the document does not exist.

The timeout for this request. Defaults to a system-specified value.

set

set(
    reference: google.cloud.firestore_v1.base_document.BaseDocumentReference,
    document_data: dict,
    merge: Union[bool, list] = 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: google.cloud.firestore_v1.base_document.BaseDocumentReference,
    field_updates: dict,
    option: Optional[google.cloud.firestore_v1._helpers.WriteOption] = 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.