add_to_target

# File activerecord/lib/active_record/associations/collection_association.rb, line 340
      def add_to_target(record)
        callback(:before_add, record)
        yield(record) if block_given?

        if options[:uniq] && index = @target.index(record)
          @target[index] = record
        else
          @target << record
        end

        callback(:after_add, record)
        set_inverse_instance(record)

        record
      end