Fields to include.
Fields to include. The resulting objects will contain only these fields
(project: StringAdd).self
(project: StringFormat).self
(project: ArrowAssoc[Project]).x
(Since version 2.10.0) Use leftOfArrow
instead
(project: Ensuring[Project]).x
(Since version 2.10.0) Use resultOfEnsuring
instead
Reshapes a document stream by renaming, adding, or removing fields. Also use "Project" to create computed values or sub-objects. http://docs.mongodb.org/manual/reference/aggregation/project/#_S_project
Fields to include. The resulting objects will contain only these fields