handle_dependency

# File activerecord/lib/active_record/associations/has_many_association.rb, line 13
      def handle_dependency
        case options[:dependent]
        when :restrict_with_exception
          raise ActiveRecord::DeleteRestrictionError.new(reflection.name) unless empty?

        when :restrict_with_error
          unless empty?
            record = owner.class.human_attribute_name(reflection.name).downcase
            owner.errors.add(:base, :'restrict_dependent_destroy.has_many', record: record)
            throw(:abort)
          end

        when :destroy
          # No point in executing the counter update since we're going to destroy the parent anyway
          load_target.each { |t| t.destroyed_by_association = reflection }
          destroy_all
        when :destroy_async
          load_target.each do |t|
            t.destroyed_by_association = reflection
          end

          unless target.empty?
            association_class = target.first.class
            primary_key_column = association_class.primary_key.to_sym

            ids = target.collect do |assoc|
              assoc.public_send(primary_key_column)
            end

            enqueue_destroy_association(
              owner_model_name: owner.class.to_s,
              owner_id: owner.id,
              association_class: reflection.klass.to_s,
              association_ids: ids,
              association_primary_key_column: primary_key_column,
              ensuring_owner_was_method: options.fetch(:ensuring_owner_was, nil)
            )
          end
        else
          delete_all
        end
      end