rails/rails — pull request #4726 by rafaelfranca (2012-01-27 17:10:59+00:00)
Title: Add create_join_table migration helper to create HABTM join tables

This helper was created as described [here](https://github.com/rails/rails/issues/4653#issuecomment-3676623).

It can help to avoid issues like this #4653.

* Docs and CHANGELOG line included