changes()
Map of changed attrs => [original value, new value].
person.changes # => {} person.name = 'bob' person.changes # => { 'name' => ['bill', 'bob'] }
# File activemodel/lib/active_model/dirty.rb, line 117 def changes changed.inject(HashWithIndifferentAccess.new){ |h, attr| h[attr] = attribute_change(attr); h } end
