instance method `attribute_will_change!`

Ruby on Rails 5.2.8.1

Since v3.0.20 Private

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:

attribute_will_change!(attr)

Handles *_will_change! for method_missing.

Parameters

attr req

Source

# File activemodel/lib/active_model/dirty.rb, line 313
      def attribute_will_change!(attr)
        unless attribute_changed?(attr)
          begin
            value = _read_attribute(attr)
            value = value.duplicable? ? value.clone : value
          rescue TypeError, NoMethodError
          end

          set_attribute_was(attr, value)
        end
        mutations_from_database.force_change(attr)
      end

Defined in activemodel/lib/active_model/dirty.rb line 313 · View on GitHub · Improve this page · Find usages on GitHub

Defined in ActiveModel::Dirty

Signature

Parameters