Rails中通过关系2转1 has_many（如何将三个模型连接在一起）

Question

连接以下三个模型的最佳方式是什么？

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

我想要实现这样的目标：

> 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)

让特定生物和团队与特定锦标赛相关联的最有效方法是什么？

编辑：以上是期望的行为..当前的问题是，一旦我将团队添加到tournament.teams中，该团队中的所有生物都会自动将该锦标赛列在creature.tournament中，而我正在尝试使生物有选择地添加到锦标赛中。一张连接表是否有可能？

谢谢！

Answer 1

提交应该是锦标赛和团队之间的连接表，对吗？

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

模型关系：

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

现在您应该能够调用：
team_1.tournaments[0].creatures