Class AsyncQuery (2.6.0)

AsyncQuery(
    parent,
    projection=None,
    field_filters=(),
    orders=(),
    limit=None,
    limit_to_last=False,
    offset=None,
    start_at=None,
    end_at=None,
    all_descendants=False,
    recursive=False,
)

Represents a query to the Firestore API.

Instances of this class are considered immutable: all methods that would modify an instance instead return a new instance.

Parameters

Name	Description
parent	`CollectionReference` The collection that this query applies to.
projection	`Optional[Projection]` A projection of document fields to limit the query results to.
field_filters	`Optional[Tuple[FieldFilter, ...]]` The filters to be applied in the query.
orders	`Optional[Tuple[Order, ...]]` The "order by" entries to use in the query.
limit	`Optional[int]` The maximum number of documents the query is allowed to return.
offset	`Optional[int]` The number of results to skip.
start_at	`Optional[Tuple[dict, bool]]` Two-tuple of : * a mapping of fields. Any field that is present in this mapping must also be present in `orders` * an `after` flag The fields and the flag combine to form a cursor used as a starting point in a query result set. If the `after` flag is :data:`True`, the results will start just after any documents which have fields matching the cursor, otherwise any matching documents will be included in the result set. When the query is formed, the document values will be used in the order given by `orders`.
end_at	`Optional[Tuple[dict, bool]]` Two-tuple of: * a mapping of fields. Any field that is present in this mapping must also be present in `orders` * a `before` flag The fields and the flag combine to form a cursor used as an ending point in a query result set. If the `before` flag is :data:`True`, the results will end just before any documents which have fields matching the cursor, otherwise any matching documents will be included in the result set. When the query is formed, the document values will be used in the order given by `orders`.
all_descendants	`Optional[bool]` When false, selects only collections that are immediate children of the `parent` specified in the containing `RunQueryRequest`. When true, selects all descendant collections.
recursive	`Optional[bool]` When true, returns all documents and all documents in any subcollections below them. Defaults to false.

Inheritance

builtins.object > BaseQuery > AsyncQuery

Methods

get

get(transaction: Optional[google.cloud.firestore_v1.transaction.Transaction] = None, retry: google.api_core.retry.Retry = <_MethodDefault._DEFAULT_VALUE: <object object>>, timeout: Optional[float] = None)

Read the documents in the collection that match this query.

This sends a RunQuery RPC and returns a list of documents returned in the stream of RunQueryResponse messages.

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 If a ``transaction`` is used and it already has write operations added, this method cannot be used (i.e. read-after-write is not allowed). The timeout for this request. Defaults to a system-specified value.

Returns

Type	Description
list	The documents in the collection that match this query.

stream

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

Read the documents in the collection that match this query.

This sends a RunQuery RPC and then returns an iterator which consumes each document returned in the stream of RunQueryResponse messages.

Note: The underlying stream of responses will time out after the max_rpc_timeout_millis value set in the GAPIC client configuration for the RunQuery API. Snapshots not consumed from the iterator before that point will be lost.

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 that fulfills the query.` The timeout for this request. Defaults to a system-specified value.