使用外键关联搜索

Question

我有一个如下所示的关联：

belongs_to :question,
    -> { where lang: I18n.locale },
    class_name: "Translation",
    foreign_key: 'question_tid',
    primary_key: 'id'
has_many :questions,
    class_name: "Translation",
    foreign_key: 'id',
    primary_key: 'question_tid'

架构如下：

#
#  id                 :integer          not null, primary key
#  question_tid       :integer
#  category_id        :integer
#  default_answer_tid :integer
#  created_at         :datetime
#  updated_at         :datetime
#

我正在尝试执行这样的搜索查询：

def self.find_by_search(search)
        return includes(:question).
               where("question like ?", "%#{search}%").
               sort_by { |q| ActiveSupport::Inflector.transliterate(q.question.text) }
    end

不过where好像不认识问题关联。我怎样才能让它明白我想要加入翻译 table 的 'question' 字段？

谢谢

Answer 1

写下来：

def self.find_by_search(search)
  return includes(:question).
         where("question like ?", "%#{search}%").
         references(:question).
         sort_by { |q| ActiveSupport::Inflector.transliterate(q.question.text) }
end

文档 includes 清楚地说：

conditions: If you want to add conditions to your included models you’ll have to explicitly reference them

使用外键关联搜索

Search with foreign key association

ruby

ruby-on-rails

rails-activerecord