ActiveRecord :: Base has_many为给定父级获取所有内容

Question

问题

下面我给出了我当前的API结果，但是，鉴于执行的SQL，它不是我预期或期望的结果。任何人都可以帮助我获取第二个SQL查询结果而不是第一个吗？

模型

console_game.rb

class ConsoleGame < ActiveRecord::Base
    self.table_name = 'console_game'
    self.primary_key = :id

    has_many :configurations, :class_name => 'Configuration'
end

configuration.rb

class Configuration < ActiveRecord::Base
    self.table_name = 'configuration'
    self.primary_key = :id
end

API

resource :configuration do
  desc "Finds all configurations associated with a game."
  params do
    requires :game, type: String, desc: "Game search.", documentation: { example: 'Battlefield 3' }
  end
  route_param :game do
    get do
      ConsoleGame.where(value: 'Battlefield 3').includes(:configurations)
    end
  end
end

调试控制台

  

D，[2014-05-06T15：11：59.071493＃31068] DEBUG - ：ConsoleGame加载（0.4ms）SELECT console_game。* FROM console_game WHERE console_game。{ {1}} =＆＃39;战地3＆＃39;   D，[2014-05-06T15：11：59.073289＃31068] DEBUG - ：配置加载（0.3ms）SELECT value。* FROM configuration WHERE configuration。{{1} IN（2）   127.0.0.1 - - [06 / May / 2014 15:12:08]＆＃34; GET /配置/游戏HTTP / 1.1＆＃34; 200 34 25.9740

结果 - 获取/配置/游戏

configuration

期望的结果 - 获取/配置/游戏

console_game_id

注意：此表上有很多外国索引，我想解决所有这些索引，但也许可以解决它们。

[ { id: 2, value: "Battlefield 3" } ]

的结果

[
    {
        id: 2,
        value: "x",
        device: 4,
        system: null,
        console_game_id: 2,
        creator: "yrdy",
        created_date: null,
        positive_votes: 0,
        negative_votes: 0
    },
    {
        id: 4,
        value: "ffds",
        system: 2,
        console_game_id: 2,
        creator: "gdfs",
        created_date: null,
        positive_votes: 0,
        negative_votes: 0
    }
]

Answer 1

这有用吗？

class ConsoleGame < ActiveRecord::Base
  #self.table_name = 'console_game'
  #self.primary_key = :id

  has_many :configurations #, :class_name => 'Configuration'
end

class Configuration < ActiveRecord::Base
  #self.table_name = 'configuration'
  #self.primary_key = :id
  belongs_to :console_game #, class_name: "ConsoleGame", primary_key: 'console_game_id', foreign_key: 'id'  #added relationship for ConsoleGame
end

resource :configuration do
  desc "Finds all configurations associated with a game."
    params do
      requires :game, type: String, desc: "Game search.", documentation: { example: 'Battlefield 3' }
    end
    route_param :game do
      get do
        #Search Configurations based on console game
        Configuration.joins(:console_game).where(console_game:{value: 'Battlefield 3'})
      end
    end
end

更好的是添加范围

class Configuration < ActiveRecord::Base
  #self.table_name = 'configuration'
  #self.primary_key = :id
  belongs_to :console_game #, class_name: "ConsoleGame", primary_key: 'console_game_id', foreign_key: 'id'  #added relationship for ConsoleGame
  scope :by_game,->(game){
           #verbosely
           #game_ids = ConsoleGame.where(value: game).pluck(:id)
           #where(console_game_id: game_ids)
           #one line
           joins(:console_game).where(console_game:{value: game})
           }
end    

用作

Configuration.by_game('Battlefield 3')

编辑

我已经注释掉了不需要的行，因为它们是由设计隐含的