only

# File activerecord/lib/active_record/relation/spawn_methods.rb, line 92
    def only(*onlies)
      result = self.class.new(@klass, table)

      ((Relation::ASSOCIATION_METHODS + Relation::MULTI_VALUE_METHODS) & onlies).each do |method|
        result.send(:"#{method}_values=", send(:"#{method}_values"))
      end

      (Relation::SINGLE_VALUE_METHODS & onlies).each do |method|
        result.send(:"#{method}_value=", send(:"#{method}_value"))
      end

      # Apply scope extension modules
      result.send(:apply_modules, extensions)

      result
    end