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DATAMONGO-1082 - Improved documentation of alias usage in aggregation framework.

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Added missing JavaDoc and added short note to the reference documentation.

Original pull request: #268.
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Thomas Darimont
2015-01-20 18:12:18 +01:00
committed by Oliver Gierke
parent 4055365c57
commit 3f7b0f1eb6
2 changed files with 26 additions and 7 deletions
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src/main/asciidoc/reference/mongodb.adoc
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@@ -1538,7 +1538,8 @@ Note that the aggregation operations not listed here are currently not supported
[[mongo.aggregation.projection]]
=== Projection Expressions
Projection expressions are used to define the fields that are the outcome of a particular aggregation step. Projection expressions can be defined via the `project` method of the `Aggregate` class.
Projection expressions are used to define the fields that are the outcome of a particular aggregation step. Projection expressions can be defined via the `project` method of the `Aggregate` class either by passing a list of `String`s or an aggregation framework `Fields` object. The projection can be extended with additional fields through a fluent API via the `and(String)` method and aliased via the `as(String)` method.
Note that one can also define fields with aliases via the static factory method `Fields.field` of the aggregation framework that can then be used to construct a new `Fields` instance.
.Projection expression examples
====