Name of the field to aggregate on.
Sequence of operators specifying aggregate calculation.
Name of the field to aggregate on.
(groupField: StringAdd).self
(groupField: StringFormat).self
(groupField: ArrowAssoc[GroupField]).x
(Since version 2.10.0) Use leftOfArrow
instead
(groupField: Ensuring[GroupField]).x
(Since version 2.10.0) Use resultOfEnsuring
instead
Groups documents together to calulate aggregates on document collections. This command aggregates on one field. http://docs.mongodb.org/manual/reference/aggregation/group/#_S_group
Name of the field to aggregate on.
Sequence of operators specifying aggregate calculation.