create

# File activerecord/lib/active_record/associations/has_many_through_association.rb, line 13
      def create(attrs = nil)
        transaction do
          object = if attrs
            @reflection.klass.send(:with_scope, :create => attrs) {
              @reflection.create_association
            }
          else
            @reflection.create_association
          end
          raise_on_type_mismatch(object)
          add_record_to_target_with_callbacks(object) do |r|
            insert_record(object, false)
          end
          object
        end
      end