rails/rails — pull request #18278 by Carpetsmoker (2014-12-31 17:53:53+00:00)
Title: Allow bypassing readonly

This is useful if you want to save a record even though it is marked as readonly.

[A scenario where this is useful](http://stackoverflow.com/questions/27723375/bypass-readonly-when-saving-activerecord/27723606)

I have not updated any docs, but if this patch looks okay, I'll also update the documentation.