Mysql 创建自定义多对多关联-RubyonRails

我正在尝试制作一个应用程序来存储播放的国际足联比赛

我在建立正确的协会方面遇到了一些困难

我现在有两个模型，用户和游戏

模式：

ActiveRecord::Schema.define(version: 20160402112419) do

  create_table "games", force: :cascade do |t|
    t.integer  "home_team_user_id"
    t.integer  "away_team_user_id"
    t.string   "home_score"
    t.string   "away_score"
    t.integer  "winner_id"
    t.integer  "loser_id"
    t.datetime "created_at",        null: false
    t.datetime "updated_at",        null: false
  end

  create_table "games_users", id: false, force: :cascade do |t|
    t.integer "user_id"
    t.integer "game_id"
  end

  add_index "games_users", ["user_id", "game_id"], name: "index_games_users_on_user_id_and_game_id"

  create_table "users", force: :cascade do |t|
    t.string   "username"
    t.string   "email",                  default: "", null: false
    t.string   "encrypted_password",     default: "", null: false
    t.string   "reset_password_token"
    t.datetime "reset_password_sent_at"
    t.datetime "remember_created_at"
    t.integer  "sign_in_count",          default: 0,  null: false
    t.datetime "current_sign_in_at"
    t.datetime "last_sign_in_at"
    t.string   "current_sign_in_ip"
    t.string   "last_sign_in_ip"
    t.datetime "created_at",                          null: false
    t.datetime "updated_at",                          null: false
  end

  add_index "users", ["email"], name: "index_users_on_email", unique: true
  add_index "users", ["reset_password_token"], name: "index_users_on_reset_password_token", unique: true

end

型号：

class Game < ActiveRecord::Base
    has_and_belongs_to_many :users
end

class User < ActiveRecord::Base
    has_and_belongs_to_many :games
  # Include default devise modules. Others available are:
  # :confirmable, :lockable, :timeoutable and :omniauthable
  devise :database_authenticatable, :registerable,
         :recoverable, :rememberable, :trackable, :validatable
end

---

因为实际上一个用户有很多游戏，但在那个游戏中他只有一个队，主队或客队。在这个逻辑中，我将用户id分配给一个自定义外部字段。

您可以像这样实现：

class User < ActiveRecord::Base
  has_many :home_games,    class_name: 'Game', foreign_key: 'home_team_user_id'
  has_many :away_games, class_name: 'Task', foreign_key: 'away_team_user_id'
end

class Game < ActiveRecord::Base
  belongs_to :home_user,    class_name: "User", foreign_key: "home_team_user_id"
  belongs_to :away_user, class_name: "User", foreign_key: "away_team_user_id"
  # Rails anticipate foreign keys itself so, addig `foreign_keys` is not
  # necessary in this class as we've already mentioned `belongs_to :home_user`
end

class用户

class User < ActiveRecord::Base

    has_many :games, :foreign_key => "home_team_user_id"
    has_many :games, :foreign_key => "away_team_user_id"


  # Include default devise modules. Others available are:
  # :confirmable, :lockable, :timeoutable and :omniauthable
  devise :database_authenticatable, :registerable,
         :recoverable, :rememberable, :trackable, :validatable
end



class Game < ActiveRecord::Base

    belongs_to :user, :foreign_key => "home_team_user_id"
    belongs_to :user, :foreign_key => "away_team_user_id"
end

class User < ActiveRecord::Base
  has_many :home_games,    class_name: 'Game', foreign_key: 'home_team_user_id'
  has_many :away_games, class_name: 'Task', foreign_key: 'away_team_user_id'
end

class Game < ActiveRecord::Base
  belongs_to :home_user,    class_name: "User", foreign_key: "home_team_user_id"
  belongs_to :away_user, class_name: "User", foreign_key: "away_team_user_id"
  # Rails anticipate foreign keys itself so, addig `foreign_keys` is not
  # necessary in this class as we've already mentioned `belongs_to :home_user`
end