call_reject_if

# File activerecord/lib/active_record/nested_attributes.rb, line 452
    def call_reject_if(association_name, attributes)
      return false if has_destroy_flag?(attributes)
      case callback = self.nested_attributes_options[association_name][:reject_if]
      when Symbol
        method(callback).arity == 0 ? send(callback) : send(callback, attributes)
      when Proc
        callback.call(attributes)
      end
    end