ruby-on-rails - ruby/rails NoMethodError？使用自定义验证方法时

Question

我是 ruby​​ 和 rails 的新手，遇到了一个相当奇怪的错误:

class Person < ActiveRecord::Base
    validates_presence_of :description, :if => require_description_presence?

    def require_description_presence?
        self.can_send_email
    end
end

加注

NoMethodError in PeopleController#index

undefined method `require_description_presence?' for #<Class:0x4c4fadc> 

Answer 1

您应该将验证方法作为符号传递:

validates_presence_of :description, :if => :require_description_presence?