jmpage/dirty_associations — pull request #4 by cddr (2014-04-21 17:13:31+00:00)
Title: Dirty nested attributes

The association is the only attribute we can be sure exists on the
model so I think it makes sense to give the association name to
the `attribute_will_change!` message. This gives clients of the
library a single way of checking whether some association has
changed regardless of whether it was changed by setting the assoc
itself, or the asssoc's ids or attributes (in case of
accepts_nested_attributes)