您如何按 Rails 中每个游戏字段的名称订购锦标赛游戏？

Question

我有以下型号：

class Tournament < ApplicationRecord
  has_many :games, inverse_of: :tournament, dependent: :destroy

  accepts_nested_attributes_for :games, allow_destroy: true
end

class Game < ApplicationRecord
  belongs_to :tournament
  belongs_to :field, optional: true
end

class Field < ApplicationRecord
  has_many :games, dependent: :destroy
end

我想根据玩游戏的场地名称来排序游戏，但在游戏中我只能访问 field_id，而不是 field.name。

t.games.order('field.name') 和 t.games.order('fields.name') 不起作用。他们给出了 ActiveRecord::StatementInvalid (PG::UndefinedTable: ERROR: missing FROM-clause entry for table "fields") 错误。

Answer 1

tournament.games.left_joins(:field).order('fields.name') 成功了。

您如何按 Rails 中每个游戏字段的名称订购锦标赛游戏？

How do you order a tournaments games by the name of each games field in Rails?

ruby-on-rails

rails-activerecord