object Group
$groups documents together to calculate aggregates on document collections .
This command aggregates on arbitrary identifiers.
Document fields identifier must be prefixed with $.
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- def apply(idField: String)(ops: (String, (AggregationFramework.this)#GroupFunction)*): (AggregationFramework.this)#Group
- idField
the name of the ID field (without $ prefix)
- ops
the sequence of operators specifying aggregate calculation
- def apply(identifiers: P.Value)(ops: (String, (AggregationFramework.this)#GroupFunction)*): (AggregationFramework.this)#Group
- identifiers
any BSON value acceptable by mongodb as identifier
- ops
the sequence of operators specifying aggregate calculation
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