在Rails中設計關係的建議

我需要連接2個玩家連接桌子。該連接表必須具有活動標誌，並且可能會有更多屬性前進。我希望能夠將2 Players與PlayerLink和active_player和passive_player相關聯，所以我可以說player_link.active_player.name。在Rails中設計關係的建議

我試過以下，但沒有得到我想要的行爲。也許我錯過了一些愚蠢的東西，或者錯誤地接近它。

module V1 
    class Player < ActiveRecord::Base 

    belongs_to :player_link 

    end  
end 

module V1 
    class PlayerLink < ActiveRecord::Base 

    has_one :active_player, class_name: "Player", foreign_key: :active_player_id 
    has_one :passive_player, class_name: "Player", foreign_key: :passive_player_id 
    end 
end

schema.rb項：

create_table "player_links", force: true do |t| 
    t.integer "active_player_id" 
    t.integer "passive_player_id" 
    t.boolean "active" 
    t.datetime "created_at" 
    t.datetime "updated_at" 
    end

測試查詢炸燬：

V1::PlayerLink.where(active: true).each do |l| 
    l.active_player.update_attribute(:foo, bar) 
    l.passive_player.update_attribute(:foo, bar 
end

與錯誤：

ActiveRecord::StatementInvalid: SQLite3::SQLException: no such column: players.active_player_id: SELECT "players".* FROM "players" WHERE "players"."active_player_id" = ?

獎勵：爲什麼Rails的查詢agains players？

來源

2014-09-03 Joe Essey

這些被稱爲自我指涉協會 - 我第一次遇到麻煩時也遇到了麻煩。

嘗試修改您的控制器邏輯如下：

module V1 
    class Player < ActiveRecord::Base 

    has_many :player_links 

    end  
end 

module V1 
    class PlayerLink < ActiveRecord::Base 

    belongs_to :player, :foreign_key => "active_player_id" 
    belongs_to :passive_player, :class_name => "Player", :foreign_key => "passive_player_id" 

    end 
end

欲瞭解更多信息，請參閱RailsCast #163。

來源

2014-09-03 03:46:56

在Rails中設計關係的建議

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