Ruby on rails 为什么我的多对多关联失败了？

我已经建立了一个类似twitter的跟踪模型。用户可以相互订阅。尝试创建关系时，我的用户控制器中出现错误

user.rb：

has_many :subscriptions
has_many :providers, :through => :subscriptions

has_many :followings, :class_name => "Subscription"
has_many :followers, :through => :followings

def follow(other_user)
  Subscription.create(:provider => other_user, :follower => self)
end

has_many :subscriptions, :foreign_key => "subscriber_id", :dependent => :destroy
has_many :subscribed_to, :through => :subscriptions, :source => :provider

has_many :reverse_subscriptions, :class_name => "Subscription", :foreign_key => "provider_id", :dependent => :destroy
has_many :followers, :through => :reverse_subscriptions

def following?(provider)
  subscriptions.find_by_provider_id(provider)
end

def follow!(provider)
  subscriptions.create!(:provider_id => provider.id)
end

def unfollow!(provider)
  subscriptions.find_by_provider_id(provider).destroy
end

subscription.rb

belongs_to :provider, :class_name => 'User', :foreign_key => "provider_id"
belongs_to :follower, :class_name => 'User', :foreign_key => "follower_id"

用户\u controller.rb

69 def follow
70   logger.debug params.to_yaml
71   @user = User.find(params["user_id"])
72   logger.debug @user.to_yaml
73   if current_user.providers << @user
74     flash[:notice] = "Subscribed"
75   else
76     flash[:error] = "Unable to subscribe."
77   end
78 end

def follow
  @user = User.find(params["user_id"])
  if current_user.follow(@user)
    flash[:notice] = "Subscribed"
  else
    flash[:error] = "Unable to subscribe."
  end
end

我已经验证我运行了rake db:migrate-订阅表有两个字段provider\u id和follower\u id。有人能帮我解决这个错误并解释它为什么要查找“user\u id”属性吗

更新：

show.html.erb：

<%= button_to "Subscribe", user_follow_path(@user), :remote => true %>

rake路线| grep如下：

user_follow POST     /users/:user_id/follow(.:format)                    {:action=>"follow", :controller=>"users"}

---

它给您一个错误的原因是，当您调用

作为指南时，我提出了这个解决方案，它修复了数据模型，使收集函数能够正常工作

使提供程序id可访问并删除订阅模型中的外键

subscription.rb：

attr_accessible :provider_id
belongs_to :provider, :class_name => 'User'
belongs_to :follower, :class_name => 'User'

在用户模型中为订阅和反向订阅添加外键

user.rb：

has_many :subscriptions
has_many :providers, :through => :subscriptions

has_many :followings, :class_name => "Subscription"
has_many :followers, :through => :followings

def follow(other_user)
  Subscription.create(:provider => other_user, :follower => self)
end

has_many :subscriptions, :foreign_key => "subscriber_id", :dependent => :destroy
has_many :subscribed_to, :through => :subscriptions, :source => :provider

has_many :reverse_subscriptions, :class_name => "Subscription", :foreign_key => "provider_id", :dependent => :destroy
has_many :followers, :through => :reverse_subscriptions

def following?(provider)
  subscriptions.find_by_provider_id(provider)
end

def follow!(provider)
  subscriptions.create!(:provider_id => provider.id)
end

def unfollow!(provider)
  subscriptions.find_by_provider_id(provider).destroy
end

我还向用户模型添加了助手方法

user.rb：

has_many :subscriptions
has_many :providers, :through => :subscriptions

has_many :followings, :class_name => "Subscription"
has_many :followers, :through => :followings

def follow(other_user)
  Subscription.create(:provider => other_user, :follower => self)
end

has_many :subscriptions, :foreign_key => "subscriber_id", :dependent => :destroy
has_many :subscribed_to, :through => :subscriptions, :source => :provider

has_many :reverse_subscriptions, :class_name => "Subscription", :foreign_key => "provider_id", :dependent => :destroy
has_many :followers, :through => :reverse_subscriptions

def following?(provider)
  subscriptions.find_by_provider_id(provider)
end

def follow!(provider)
  subscriptions.create!(:provider_id => provider.id)
end

def unfollow!(provider)
  subscriptions.find_by_provider_id(provider).destroy
end

然后，在控制器中，我们可以调用follow！否则就放弃

user_controller.rb：

...
current_user.unfollow!(@user)
...
current_user.follow!(@user)
...

我正在使用Desive，因此我在\u筛选器之前有以下内容：
在\u筛选器之前：验证\u用户！，：only=>[：update，：follow]
好的，我想我可能知道发生了什么，我会更新我的答案。对不起，我又编辑了一次。还添加了关于

反向原因的链接。如果可以的话，让我知道我不知道它如何与自引用关联一起工作。为了逻辑起见，我做了一些编辑和抽象。但从Rails3.1开始，只要设置了

：inverse\u of

选项，就可以通过关联操作一些。我认为你的问题在于它是自我参照的。幸运的是，当使用此解决方法时，模型仍然存在问题（例如，查找不工作）。我发布了一个更完整的解决方案来修复模型。你能在代码中注释users\u controller.b的第73行吗？