rails/strong_parameters — pull request #93 by josemota (2013-01-29 13:54:25+00:00)
Title: Mention common use case of `collection_singular_ids` in README.

ActiveRecord allows you define which items a particular
object has when it defines a `has_many` relationship.
The `collection_singular_ids` method sets those items and it's
complicated to realize that for newcomers to the functionality.

The request tells that to the users, reducing learning friction.