instance method `previous_changes`

Ruby on Rails 6.0.6

Since v3.0.20

Compare with:

previous_changes()

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"]}

Source

# File activemodel/lib/active_model/dirty.rb, line 227
    def previous_changes
      mutations_before_last_save.changes
    end

Defined in activemodel/lib/active_model/dirty.rb line 227 · View on GitHub · Improve this page · Find usages on GitHub

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