2到1 has_many通過Rails中的關係（如何將三個模型連接在一起）

Question

以下三種模型連接的最佳方式是什麼？

class Tournament < ActiveRecord::Base 
    has_many :submissions 
    has_many :creatures, :through => :submissions, :uniq => true 
    has_many :teams, :through => :submissions, :uniq => true 
end 

class Creature < ActiveRecord::Base 
    belongs_to :team 
    has_many :tournaments, :through => :team 
end 

class Submission < ActiveRecord::Base 
    belongs_to :tournament 
    belongs_to :team 
end 

class Team < ActiveRecord::Base 
    has_many :creatures 
    has_many :submissions 
    has_many :tournaments, :through => :submissions 
end 

我要實現的是這樣的：

> team_1.tournaments[0] = tournament_1 

> tournament_1.teams[0] 
(returns team_1) 

> team_1.tournaments[0].creatures 
(returns []) 

> team.tournaments[0].creatures[0] = creature_1 

> creature_1.tournaments 
(returns tournament_1) 

什麼是有一個特定的生物，與特定的比賽相關的團隊最有效的方法是什麼？

編輯：上面是期望的行爲..目前的問題是，只要我將隊伍添加到tournament.teams該團隊中的所有生物自動將該比賽列在creature.tournament中，而我試圖讓它使生物被選擇性地添加到比賽中。是否可以用一個連接表？

謝謝！

Answer 1

提交應該是您的連接表Tournaments和Teams之間的連接表，對嗎？

   Creature [id, team_id] 
          | 
          | 
          | 
         Team [id] 
          | 
          | 
          | 
      Submission [id, team_id, tournament_id] 
              | 
              | 
              | 
           Tournament [id] 

模型關係：

class Creature < ActiveRecord::Base 
    belongs_to :team 
    has_many :tournaments, :through => :team # this should work since Rails 3.1 or 3.2 
end 

class Team < ActiveRecord::Base 
    has_many :creatures 
    has_many :tournaments, :through => :submissions 
    has_many :submissions 
end 

class Submission < ActiveRecord::Base 
    belongs_to :team 
    belongs_to :tournament 
end 

class Tournament < ActiveRecord::Base 
    has_many :teams, :through => :submissions 
    has_many :creatures, :through => :teams  # this should work since Rails 3.1 or 3.2 
    has_many :submissions 
end 

現在，你應該能夠調用： team_1.tournaments[0].creatures