method

configure_dependency_for_has_one

v3.0.0 - Show latest stable - 0 notes - Class: ActiveRecord::Associations::ClassMethods

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What's this?

configure_dependency_for_has_one(reflection) private

Creates before_destroy callback methods that nullify, delete or destroy has_one associated objects, according to the defined :dependent rule. If the association is marked as :dependent => :restrict, create a callback that prevents deleting entirely.

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# File activerecord/lib/active_record/associations.rb, line 1663
        def configure_dependency_for_has_one(reflection)
          if reflection.options.include?(:dependent)
            name = reflection.options[:dependent]
            method_name = "has_one_dependent_#{name}_for_#{reflection.name}""has_one_dependent_#{name}_for_#{reflection.name}"

            case name
              when :destroy, :delete
                class_eval "def \#{method_name}\nassociation = \#{reflection.name}\nassociation.\#{name} if association\nend\n", __FILE__, __LINE__ + 1
              when :nullify
                class_eval "def \#{method_name}\nassociation = \#{reflection.name}\nassociation.update_attribute(\#{reflection.primary_key_name.inspect}, nil) if association\nend\n", __FILE__, __LINE__ + 1
              when :restrict
                method_name = "has_one_dependent_restrict_for_#{reflection.name}".to_sym
                define_method(method_name) do
                  unless send(reflection.name).nil?
                    raise DeleteRestrictionError.new(reflection)
                  end
                end
                before_destroy method_name
              else
                raise ArgumentError, "The :dependent option expects either :destroy, :delete, :nullify or :restrict (#{reflection.options[:dependent].inspect})"
            end

            before_destroy method_name
          end
        end

configure_dependency_for_has_one

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