rails accepts_nested_attributes和：reject_if

Question

我有一个带有嵌套属性的表单。现在在我的:reject_if =>语句中，我想检查嵌套模型上的属性，比如说first_record?有没有办法访问这样的方法？在我看来，您只能访问提交的属性哈希，以检查字段是否为空。谢谢！

Answer 1

根据文档http://api.rubyonrails.org/classes/ActiveRecord/NestedAttributes/ClassMethods.html

或者，：reject_if也接受使用方法的符号：

class Member < ActiveRecord::Base
  has_many :posts
  accepts_nested_attributes_for :posts, :reject_if => :new_record?
end

class Member < ActiveRecord::Base
  has_many :posts
  accepts_nested_attributes_for :posts, :reject_if => :reject_posts

  def reject_posts(attributed)
    attributed['title'].blank?
  end
end

这对你有用。基本上这意味着在自定义功能中你可以做任何你想做的事情。