ActiveRecord :: AssociationTypeMismatch：for has_many：through relationship(ActiveRecord::AssociationTypeMismatch: for has_many :through relationship)

 我正在塑造一个有很多玩家的游戏。 玩家还可以玩多个游戏。 我有用户，游戏和plays_game作为连接表。 
 
 这是我第一次涉足has_many：通过关系，所以我希望这是一个简单的问题。 或者至少是一个简单分辨率的问题。 
 
class User < ActiveRecord::Base
   has_many :played_games
   has_many :games, :through => :played_games  
end

class Game < ActiveRecord::Base
   has_many :played_games
   has_many :users, :through => :played_games
end

class PlayedGame < ActiveRecord::Base
  belongs_to :users
  belongs_to :games
end
 
 当我尝试将游戏添加到用户（从控制台）时会发生这种情况： 
 
User.first.played_games << Game.first
 
 结果是： 
 
ActiveRecord::AssociationTypeMismatch: PlayedGame(#70279902258580) expected, got Game(#70279901145600)
 
 好吧，也许我在误解。 也许这是我应该尝试添加的games ： 
 
User.first.games << Game.first.id
 
 结果是： 
 
NameError: uninitialized constant User::Games
 
 任何帮助或文档链接表示赞赏。 提前致谢！ 

I am modeling a game which has many players. Players can also play multiple games. I have users, games and played_game which is acting as the join table.
 
This is my first foray into has_many :through relationships so I'm hopeful that this is a simple question. Or at least a question with a simple resolution.
 
class User < ActiveRecord::Base
   has_many :played_games
   has_many :games, :through => :played_games  
end

class Game < ActiveRecord::Base
   has_many :played_games
   has_many :users, :through => :played_games
end

class PlayedGame < ActiveRecord::Base
  belongs_to :users
  belongs_to :games
end
 
This is what happens when I try to add a game to a user (from console):
 
User.first.played_games << Game.first
 
Results in:
 
ActiveRecord::AssociationTypeMismatch: PlayedGame(#70279902258580) expected, got Game(#70279901145600)
 
Ok, maybe I'm misunderstanding. Perhaps it's games that I should try to add to:
 
User.first.games << Game.first.id
 
Results in:
 
NameError: uninitialized constant User::Games
 
Any help or link to documentation is appreciated. Thanks in advance!

原文：https://stackoverflow.com/questions/29859098