- Companion:
- object
Value members
Abstract methods
Merges 2 sequences of projection operations together. If there are duplicate keys, the last one takes precedence.
Merges 2 sequences of projection operations together. If there are duplicate keys, the last one takes precedence.
- Value parameters:
- anotherProjection
the projection to be merged with
- Returns:
the projection
Creates a projection of a field whose value is computed from the given expression. Projection with an expression is only supported using the $project aggregation pipeline stage.
Creates a projection of a field whose value is computed from the given expression. Projection with an expression is only supported using the $project aggregation pipeline stage.
- Value parameters:
- expression
the expression
- fieldName
the field name
- Returns:
the projection
Creates a projection that includes for the given field only the first element of an array that matches the query filter. This is referred to as the positional $ operator.
Creates a projection that includes for the given field only the first element of an array that matches the query filter. This is referred to as the positional $ operator.
- Value parameters:
- fieldName
the field name whose value is the array
- Returns:
the projection
Creates a projection that includes for the given field only the first element of the array value of that field that matches the given query filter.
Creates a projection that includes for the given field only the first element of the array value of that field that matches the given query filter.
- Value parameters:
- fieldName
the field name
- filter
the filter to apply
- Returns:
the projection
Creates a projection that excludes all of the given fields.
Creates a projection that excludes all of the given fields.
- Value parameters:
- fieldName
the field name
- Returns:
the projection
Creates a projection that excludes all of the given fields.
Creates a projection that excludes all of the given fields.
- Value parameters:
- fieldNames
the field names
- Returns:
the projection
Creates a projection that excludes the _id field. This suppresses the automatic inclusion of _id that is the default, even when other fields are explicitly included.
Creates a projection that excludes the _id field. This suppresses the automatic inclusion of _id that is the default, even when other fields are explicitly included.
- Returns:
the projection
Creates a projection that includes all of the given fields.
Creates a projection that includes all of the given fields.
- Value parameters:
- fieldName
the field name
- Returns:
the projection
Creates a projection that includes all of the given fields.
Creates a projection that includes all of the given fields.
- Value parameters:
- fieldNames
the field names
- Returns:
the projection
Creates a $meta projection to the given field name for the given meta field name.
Creates a $meta projection to the given field name for the given meta field name.
- Value parameters:
- fieldName
the field name
- metaFieldName
the meta field name
- Returns:
the projection
- Since:
4.1
Creates a projection to the given field name of the textScore, for use with text queries.
Creates a projection to the given field name of the textScore, for use with text queries.
- Value parameters:
- fieldName
the field name
- Returns:
the projection
Creates a projection to the given field name of a slice of the array value of that field.
Creates a projection to the given field name of a slice of the array value of that field.
- Value parameters:
- fieldName
the field name
- limit
the number of elements to project.
- Returns:
the projection
Creates a projection to the given field name of a slice of the array value of that field.
Creates a projection to the given field name of a slice of the array value of that field.
- Value parameters:
- fieldName
the field name
- limit
the number of elements to project
- skip
the number of elements to skip before applying the limit
- Returns:
the projection