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#2650 ✓committed
Scott Barr

Added previous_changes to ActiveRecord::Dirty [PATCH]

Reported by Scott Barr | May 15th, 2009 @ 05:24 AM | in 3.0.2

I've added a previous_changes Map to ActiveRecord::Dirty

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.


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

I've attached a patch with tests

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