class documentation
Named helper aggregation for counting existence
Method | __init__ |
Undocumented |
Inherited from Count
:
Method | default |
Returns the default result for this aggregation. |
Method | parse |
Parses the output of to_mongo . |
Method | to |
Returns the MongoDB aggregation pipeline for this aggregation. |
Method | _kwargs |
Returns a list of [name, value] lists describing the parameters of this aggregation instance. |
Instance Variable | _unwind |
Undocumented |
Inherited from Aggregation
(via Count
):
Method | __eq__ |
Undocumented |
Method | __repr__ |
Undocumented |
Method | __str__ |
Undocumented |
Property | field |
The name of the field being computed on, if any. |
Class Method | _from |
Creates an Aggregation instance from a serialized JSON dict representation of it. |
Method | _needs |
Whether the aggregation requires frame labels of video samples to be attached. |
Method | _needs |
Whether the aggregation requires group slice(s) to be attached. |
Method | _serialize |
Returns a JSON dict representation of the Aggregation . |
Instance Variable | _expr |
Undocumented |
Instance Variable | _field |
Undocumented |
Instance Variable | _safe |
Undocumented |
Instance Variable | _uuid |
Undocumented |
Property | _has |
Whether the aggregation's result is returned across multiple documents. |
Property | _is |
Whether the aggregation has big results and its pipeline is defined by a single $project stage and thus can be combined with other such aggregations. |