rails/rails — pull request #7716 by steveklabnik (2012-09-20 12:10:35+00:00)
Title: Coerce strings in create_join_table.

If you accidentally pass a string and a symbol, this breaks. So
we coerce them both to strings.

Fixes #7715.

I'm not 100% sure we care to be this defensive, but the change was easy enough.

/cc @tenderlove @jonleighton