handle_dependency

# File activerecord/lib/active_record/associations/belongs_to_association.rb, line 7
      def handle_dependency
        return unless load_target

        case options[:dependent]
        when :destroy
          raise ActiveRecord::Rollback unless target.destroy
        when :destroy_async
          if reflection.foreign_key.is_a?(Array)
            primary_key_column = reflection.active_record_primary_key
            id = reflection.foreign_key.map { |col| owner.public_send(col) }
          else
            primary_key_column = reflection.active_record_primary_key
            id = owner.public_send(reflection.foreign_key)
          end

          association_class = if reflection.polymorphic?
            owner.public_send(reflection.foreign_type)
          else
            reflection.klass
          end

          enqueue_destroy_association(
            owner_model_name: owner.class.to_s,
            owner_id: owner.id,
            association_class: association_class.to_s,
            association_ids: [id],
            association_primary_key_column: primary_key_column,
            ensuring_owner_was_method: options.fetch(:ensuring_owner_was, nil)
          )
        else
          target.public_send(options[:dependent])
        end
      end