method

attribute_will_change!

Importance_0
v5.1.7 - Show latest stable - 0 notes - Class: ActiveRecord::AttributeMethods::Dirty
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attribute_will_change!(attr_name) private

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# File activerecord/lib/active_record/attribute_methods/dirty.rb, line 277
        def attribute_will_change!(attr_name)
          super
          if self.class.has_attribute?(attr_name)
            mutations_from_database.force_change(attr_name)
          else
            ActiveSupport::Deprecation.warn(              #{attr_name} is not an attribute known to Active Record.              This behavior is deprecated and will be removed in the next              version of Rails. If you'd like #{attr_name} to be managed              by Active Record, add `attribute :#{attr_name} to your class..squish)
            mutations_from_database.deprecated_force_change(attr_name)
          end
        end
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