create!

# File activerecord/lib/active_record/associations/has_many_through_association.rb, line 11
      def create!(attrs = nil)
        @reflection.klass.transaction do
          self << (object = attrs ? @reflection.klass.send(:with_scope, :create => attrs) { @reflection.klass.create! } : @reflection.klass.create!)
          object
        end
      end