验证自引用关联不会链接回 Rails 中的原始实例

发布于 2024-09-08 05:24:40 字数 779 浏览 10 评论 0原文

我有一个多对多模型，遵循这个很棒的railscast

我的模型将作者彼此联系起来。我想证实一个作者不能给自己加好友。我知道我可以在 UI 级别处理这个问题，但我希望进行验证以防止 UI 中的错误允许它。我尝试过 validates_exclusion_of，但它不起作用。这是我的关系模型：

class Friendship < ActiveRecord::Base
  # prevent duplicates
  validates_uniqueness_of :friend_id, :scope => :author_id
  # prevent someone from following themselves (doesn't work)
  validates_exclusion_of :friend_id, :in => [:author_id]

  attr_accessible :author_id, :friend_id
  belongs_to :author
  belongs_to :friend, :class_name => "Author"
end

原文

I have a many-to-many model, following the example in this great railscast

My model links authors to each other. I'd like to validate that an author cannot friend himself. I know I can handle this at the UI level, but I'd love to have a validation in place to prevent a bug in the UI from allowing it. I've tried validates_exclusion_of, but it doesn't work. Here's my model for the relationship:

class Friendship < ActiveRecord::Base
  # prevent duplicates
  validates_uniqueness_of :friend_id, :scope => :author_id
  # prevent someone from following themselves (doesn't work)
  validates_exclusion_of :friend_id, :in => [:author_id]

  attr_accessible :author_id, :friend_id
  belongs_to :author
  belongs_to :friend, :class_name => "Author"
end

分享到QQ

分享到微博

如果你对这篇内容有疑问，欢迎到本站社区发帖提问参与讨论，获取更多帮助，或者扫码二维码加入 Web 技术交流群。

发布评论

需要登录才能够评论，你可以免费注册一个本站的账号。

小伙你站住 2024-09-15 05:24:40

您必须使用自定义验证：

class Friendship < ActiveRecord::Base
  # ...

  validate :disallow_self_referential_friendship

  def disallow_self_referential_friendship
    if friend_id == author_id
      errors.add(:friend_id, 'cannot refer back to the author')
    end
  end
end

You'll have to use a custom validation:

class Friendship < ActiveRecord::Base
  # ...

  validate :disallow_self_referential_friendship

  def disallow_self_referential_friendship
    if friend_id == author_id
      errors.add(:friend_id, 'cannot refer back to the author')
    end
  end
end

回复收藏 0 原文

~没有更多了~