Ruby on rails Rails关联：SQLite3:：SQLException:没有这样的列

我有以下设置：

class Invite < ActiveRecord::Base
    belongs_to :attending_guest, :class_name => "User", :foreign_key => :attending_guest_id
    belongs_to :attending_event, :class_name => "Event"
end

class Event < ActiveRecord::Base
    belongs_to :creator, :class_name => "User"
    has_many :invites
    has_many :attendees, :through => :invites, :source => :attending_event
end

class User < ActiveRecord::Base
    has_many :created_events, :foreign_key => "creator_id", :class_name => "Event"
    has_many :invites
    has_many :attended_events, through: :invites, source: :attending_guest
end

创建此关系后，在cnosole中，运行时出现以下错误：

2.2.0 :001 > u = User.first
  User Load (0.2ms)  SELECT  "users".* FROM "users"  ORDER BY "users"."id" ASC LIMIT 1
 => #<User id: 1, name: "User One", email: "user@example.com", created_at: "2015-11-14 09:20:26", updated_at: "2015-11-14 09:20:26"> 
2.2.0 :002 > u.attended_events
  User Load (0.4ms)  SELECT "users".* FROM "users" INNER JOIN "invites" ON "users"."id" = "invites"."attending_guest_id" WHERE "invites"."user_id" = ?  [[nil, 1]]
SQLite3::SQLException: no such column: invites.user_id: SELECT "users".* FROM "users" INNER JOIN "invites" ON "users"."id" = "invites"."attending_guest_id" WHERE "invites"."user_id" = ?
ActiveRecord::StatementInvalid: SQLite3::SQLException: no such column: invites.user_id: SELECT "users".* FROM "users" INNER JOIN "invites" ON "users"."id" = "invites"."attending_guest_id" WHERE "invites"."user_id" = ?

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有人能解释发生了什么事吗？我试过很多不同的方法，但就是不明白问题出在哪里。。。任何帮助都将不胜感激！非常感谢

此错误显示邀请中没有用户id列

按照惯例，Rails假定用于在另一个模型上保存外键的列是该模型的名称，并添加了后缀_id。：foreign_key选项允许您直接设置外键的名称

因此，你可以加上：

class User < ActiveRecord::Base
  has_many :invites, :foreign_key => :attending_guest_id
end

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为什么你使用自定义外键名而不遵循rails惯例？抱歉，主要原因是我想了解Active Record中所有可用选项的不同用法。这是一个很好的原因，你应该在你的问题中注意到。是的，这很有效，你的解释让我看到了发生的巨大变化，非常感谢你！

class User < ActiveRecord::Base
  has_many :invites, :foreign_key => :attending_guest_id
end