rails/rails — pull request #15871 by yuki24 (2014-06-23 02:16:32+00:00)
Title: Add #model_name instance method to ActiveModel::Naming

This pull request addresses #15428 and [discussion on the Rails Core mailing list](https://groups.google.com/forum/#!topic/rubyonrails-core/ThSaXw9y1F8).