Question

我对Rails中的关联有一点问题。

事实上，我有一个Class 播放器，其中has_many 违规属于 SteamServer has_many InfractionTag ，其中belongs_to 代码

我想得到一个播放器的Infraction，服务器以及这个违规的所有标签。我做了：

infractions = Infraction.where(player_steamid64: self.steamid64).includes(:steam_server, :infraction_tags);

但我明白了：

{:infraction_type=>"Ban", :severite=>"Critique", :length=>"01d:00h:00m", :infraction_rp=>"No", :tags=>nil, :steam_server=>#<SteamServer id: 1, name: "Serveur Dev Pure System", ip: "188.165.198.224", ip_query: "188.165.198.224", port: 27015, begin_date: "2015-11-24 00:00:00", reputation: "0,100", reputation_rp: "0,100", accept_new: true, cache: false, validated: true, banner_460: nil, created_at: "2015-11-24 00:00:00", updated_at: "2015-11-24 00:00:00">, :created_at=>"24/11/2015 00:00"}

：tags是nil，但是当我在MySQL中发出这个查询时：

SELECT `infraction_tags`.* FROM `infraction_tags` WHERE `infraction_tags`.`id` IN (1)

我得到了一个结果。

以下是我的模特：

播放器

class Player < ActiveRecord::Base
    has_many :infractions, class_name: 'Infraction', primary_key: 'steamid64', foreign_key: 'player_steamid64'
end

违规

class Infraction < ActiveRecord::Base
    has_many :infraction_tags
    belongs_to :player, class_name: 'Player', foreign_key: 'steamid64'
    belongs_to :steam_server, class_name: 'SteamServer', foreign_key: 'id'
end

InfractionTag

class InfractionTag < ActiveRecord::Base
    belongs_to :tag
    belongs_to :infraction
end

代码

class Tag < ActiveRecord::Base
    has_many :infraction_tags
end

SteamServer

class SteamServer < ActiveRecord::Base
end

有人会知道如何以更少的请求获取所有标签？非常感谢你！

Answer 1

class Infraction < ActiveRecord::Base
    has_many :infraction_tags
    has_many :tags, through: :infraction_tags
    belongs_to :player, class_name: 'Player', foreign_key: 'steamid64'
    belongs_to :steam_server, class_name: 'SteamServer', foreign_key: 'id'
end

来自.includes(:steam_server, :infraction_tags)

到.includes(:steam_server, :tags)

Rails Association包含数组

1 个答案: