symfony/symfony-docs — pull request #3518 by guilro (2014-01-28 17:55:01+00:00)
Title: update collection.rst - add cascade_validation opt

It makes sense to describe cascade_validation option in collection
documentation. `Valid` constraint does not suit all needs, especially
when we have to set validation_groups for embed object/forms, and so
cascade_validation should not be that "hidden".