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trait Projection extends AnyRef

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  1. abstract def combinedWith(anotherProjection: Projection): Projection

    Merges 2 sequences of projection operations together.

    Merges 2 sequences of projection operations together. If there are duplicate keys, the last one takes precedence.

    anotherProjection

    the projection to be merged with

    returns

    the projection

  2. abstract def computed[T](fieldName: String, expression: T): Projection

    Creates a projection of a field whose value is computed from the given expression.

    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.

    fieldName

    the field name

    expression

    the expression

    returns

    the projection

  3. abstract def elemMatch(fieldName: String, filter: Filter): 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.

    fieldName

    the field name

    filter

    the filter to apply

    returns

    the projection

  4. abstract def elemMatch(fieldName: String): Projection

    Creates a projection that includes for the given field only the first element of an array that matches the query filter.

    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.

    fieldName

    the field name whose value is the array

    returns

    the projection

  5. abstract def exclude(fieldNames: Seq[String]): Projection

    Creates a projection that excludes all of the given fields.

    Creates a projection that excludes all of the given fields.

    fieldNames

    the field names

    returns

    the projection

  6. abstract def exclude(fieldName: String): Projection

    Creates a projection that excludes all of the given fields.

    Creates a projection that excludes all of the given fields.

    fieldName

    the field name

    returns

    the projection

  7. abstract def excludeId: Projection

    Creates a projection that excludes the _id field.

    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

  8. abstract def include(fieldNames: Seq[String]): Projection

    Creates a projection that includes all of the given fields.

    Creates a projection that includes all of the given fields.

    fieldNames

    the field names

    returns

    the projection

  9. abstract def include(fieldName: String): Projection

    Creates a projection that includes all of the given fields.

    Creates a projection that includes all of the given fields.

    fieldName

    the field name

    returns

    the projection

  10. abstract def meta(fieldName: String, metaFieldName: String): 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.

    fieldName

    the field name

    metaFieldName

    the meta field name

    returns

    the projection

    Since

    4.1

  11. abstract def metaTextScore(fieldName: String): Projection

    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.

    fieldName

    the field name

    returns

    the projection

  12. abstract def slice(fieldName: String, skip: Int, limit: Int): 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.

    fieldName

    the field name

    skip

    the number of elements to skip before applying the limit

    limit

    the number of elements to project

    returns

    the projection

  13. abstract def slice(fieldName: String, limit: Int): 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.

    fieldName

    the field name

    limit

    the number of elements to project.

    returns

    the projection

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