Flowdock
method

previous_changes

Importance_1
Ruby on Rails latest stable (v4.0.2) - 0 notes - Class: ActiveModel::Dirty
previous_changes() public

Returns a hash of attributes that were changed before the model was saved.

person.name # => "bob"
person.name = 'robert'
person.save
person.previous_changes # => {"name" => ["bob", "robert"]}
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