[Sqlalchemy-tickets] Issue #3538: docs clarification- orm.joinedload (zzzeek/sqlalchemy)

[jvanasco <iss...@bi...>]

New issue 3538: docs clarification- orm.joinedload
https://bitbucket.org/zzzeek/sqlalchemy/issues/3538/docs-clarification-ormjoinedload

jvanasco:

I'd like to suggest extending the note in the docs on orm.joined load with something like the following: [http://docs.sqlalchemy.org/en/latest/orm/loading_relationships.html#sqlalchemy.orm.joinedload, http://docs.sqlalchemy.org/en/rel_0_8/orm/loading.html#sqlalchemy.orm.joinedload]

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If you have already explicitly JOINed a collection onto your query for filtering (or other use), you will likely want to use `orm.contains_eager` instead of `orm.joinedload`.  `joinedload` will create a second anonymously aliased join, while `contains_eager` will more efficiently re-use the existing join.
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