Ruby on rails 来自单个表的多个引用

我已经看过几次提到这个问题，但都不太完整。我在为单个模型使用联接表时遇到问题。例如，假设我们有用户和HighFive。Highfives将只是两个用户HighFive的联接表。所以我有这个：

class Highfive < ActiveRecord::Base
  belongs_to :user1,
             :class_name => "User"

  belongs_to :user2,
             :class_name => "User"
end

class User < ActiveRecord::Base
  has_many :highfives
end

真的，我应该得到这样一个查询：

SELECT "highfives".* FROM "highfives" WHERE "highfives"."user_id" = 1

SELECT "highfives".* FROM "highfives" WHERE "highfives"."user1_id" = 1 or "highfives"."user2_id" = 1

我想要做到这一点，我需要以某种方式修改我的用户模型。但我错过了什么

---

谢谢。

在您的型号中指定

：外键。所以

class Highfive < ActiveRecord::Base
  belongs_to :user1,
             :class_name => "User",
             :foreign_key => "user1_id"

  belongs_to :user2,
             :class_name => "User",
             :foreign_key => "user2_id"
end

class User < ActiveRecord::Base
  has_many :highfive1, 
           :class_name => "Highfive",
           :foreign_key => "highfive1_id"
  has_many :highfive2, 
           :class_name => "Highfive",
           :foreign_key => "highfive2_id"
end

class Highfive“用户”，
：foreign\u key=>“user1\u id”
属于：user2，
：class_name=>“用户”，
：foreign\u key=>“user2\u id”
结束
类用户“Highfive”，
：外键=>“highfive1\u id”
有很多：highfive2，
：class_name=>“Highfive”，
：外键=>“highfive2\u id”
结束

在您的型号中指定
：外键。所以

class Highfive < ActiveRecord::Base
  belongs_to :user1,
             :class_name => "User",
             :foreign_key => "user1_id"

  belongs_to :user2,
             :class_name => "User",
             :foreign_key => "user2_id"
end

class User < ActiveRecord::Base
  has_many :highfive1, 
           :class_name => "Highfive",
           :foreign_key => "highfive1_id"
  has_many :highfive2, 
           :class_name => "Highfive",
           :foreign_key => "highfive2_id"
end

class Highfive“用户”，
：foreign\u key=>“user1\u id”
属于：user2，
：class_name=>“用户”，
：foreign\u key=>“user2\u id”
结束
类用户“Highfive”，
：外键=>“highfive1\u id”
有很多：highfive2，
：class_name=>“Highfive”，
：外键=>“highfive2\u id”
结束

您需要在
has-many
语句中指定外键，否则Rails将假定它是
用户id
：

class User < ActiveRecord::Base
  has_many :highfives, :foreign_key => :user1_id
end

您需要在
has\u many
语句中指定外键，否则Rails将假定它是
用户id
：

class User < ActiveRecord::Base
  has_many :highfives, :foreign_key => :user1_id
end

我相信
外键
应该是
user1id
/
user2id
。我相信
外键
应该是
user1id
/
user2id
。这很简单。不知道为什么我忽略了它。谢谢这很简单。不知道为什么我忽略了它。谢谢