Rails Ruby on Rails

I added this feature so that a Map of changed fields could be retrieved
after a model had been saved. This is useful in the after_save callback
when you need to know what fields changed. At present there is no way
to do this other than have code in the before_save callback that takes
a copy of the changes Map, which I thought was a bit messy.

Example.

person = Person.find_by_name('bob') person.name = 'robert' person.changes # => {'name' => ['bob, 'robert']} person.save person.changes # => {} person.previous_changes # => {'name' => ['bob, 'robert']} person.reload person.previous_changes # => {}

Signed-off-by: Joshua Peek josh@joshpeek.com
http://github.com/rails/rails/commit/80989437dc1502f9194b0600941b6d...