instance method `previous_changes`

Ruby on Rails 5.2.8.1

Since v3.0.20

Available in: v3.0.20 v3.1.12 v3.2.22.5 v4.0.13 v4.1.16 v4.2.9 v5.2.8.1 v6.0.6 v6.1.7.10 v7.0.10 v7.1.6 v7.2.3 v8.0.4 v8.1.2

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 246
    def previous_changes
      @previously_changed ||= ActiveSupport::HashWithIndifferentAccess.new
      @previously_changed.merge(mutations_before_last_save.changes)
    end

Defined in activemodel/lib/active_model/dirty.rb line 246 · View on GitHub · Improve this page · Find usages on GitHub

Defined in ActiveModel::Dirty

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