Question

我正在努力让以下Mongoid关系起作用，但每个团队的游戏领域都是一个空数组。这不是一个有效的关系模型吗？我是否需要拆分游戏，即home_games和away_games？

class Team
  include Mongoid::Document

  has_many :games, :autosave => true

end

class Game
  include Mongoid::Document

  belongs_to :home_team, :class_name => "Team", :inverse_of => :games
  belongs_to :away_team, :class_name => "Team", :inverse_of => :games

end

Answer 1

我不这么认为有一种直接的方法可以做到这一点，可能是你的解决方法

class Team
  include Mongoid::Document

  has_many :home_played, :class_name => 'Game' , :inverse_of => :home_team
  has_many :away_played, :class_name => 'Game' , :inverse_of => :away_team


 def games
    Game.any_of({:home_team_id => self.id},{:away_team_id => self.id})
 end

end

class Game
  include Mongoid::Document

  belongs_to :home_team, :class_name => "Team", :inverse_of => :home_played
  belongs_to :away_team, :class_name => "Team", :inverse_of => :away_played

end

现在您可以像

一样使用它

g = Game.new
+--------------------------+-------+--------------------------+--------------+--------------+
| _id                      | _type | _id                      | home_team_id | away_team_id |
+--------------------------+-------+--------------------------+--------------+--------------+
| 4ec76f70b356f8031f000001 |       | 4ec76f70b356f8031f000001 |              |              |
+--------------------------+-------+--------------------------+--------------+--------------+
1 row in set
>> t=Team.new
+--------------------------+-------+--------------------------+
| _id                      | _type | _id                      |
+--------------------------+-------+--------------------------+
| 4ec76f75b356f8031f000002 |       | 4ec76f75b356f8031f000002 |
+--------------------------+-------+--------------------------+
1 row in set
>> t.save
=> true
g.home_team = t
+--------------------------+-------+--------------------------+
| _id                      | _type | _id                      |
+--------------------------+-------+--------------------------+
| 4ec76f75b356f8031f000002 |       | 4ec76f75b356f8031f000002 |
+--------------------------+-------+--------------------------+
1 row in set
>> g.save
=> true

和

>> Team.first.home_played
+--------------------------+-------+--------------------------+--------------------------+--------------+
| _id                      | _type | _id                      | home_team_id             | away_team_id |
+--------------------------+-------+--------------------------+--------------------------+--------------+
| 4ec76f70b356f8031f000001 |       | 4ec76f70b356f8031f000001 | 4ec76f75b356f8031f000002 |              |
+--------------------------+-------+--------------------------+--------------------------+--------------+
1 row in set
>> Game.first.home_team
+--------------------------+-------+--------------------------+
| _id                      | _type | _id                      |
+--------------------------+-------+--------------------------+
| 4ec76f75b356f8031f000002 |       | 4ec76f75b356f8031f000002 |
+--------------------------+-------+--------------------------+

abd你可以通过

得到总数

>> Team.first.games

希望这有帮助

Mongoid - 同一外域的两个场反转

1 个答案: