连接两个活动记录结果(通过连接表)以返回新结果

时间:2011-11-22 13:41:45

标签: ruby-on-rails activerecord model

我有以下内容:

Account --> Options
Account --> Profiles --> Options

以下是模型

# models/account.rb
class Account < ActiveRecord::Base
  has_many :accounts_has_options
  has_many :options, :through => :accounts_has_options
  has_many :accounts_has_profiles
  has_many :profiles, :through => :accounts_has_profiles
end

# models/profile.rb
class Profile < ActiveRecord::Base
  has_many :profiles_has_options
  has_many :options, :through => :profiles_has_options
  has_many :accounts_has_options
  has_many :accounts, :through => :account_has_options
end

# models/option.rb
class Option < ActiveRecord::Base
  has_many :accounts_has_options
  has_many :accounts, :through => :accounts_has_options
  has_many :profiles_has_options
  has_many :profiles, :through => :profiles_has_options
end

我希望所有与帐户关联的选项以及通过配置文件关联的所有选项,可能都在虚拟属性中。

我在这个问题中找到了一个例子: How do you concatenate two active record results to return a new result that can further be filtered? 但是他们只有两个模型,在我的例子中,我们在故事中有一个连接表。

任何想法,如何编写这样的虚拟属性?

1 个答案:

答案 0 :(得分:0)

如何将这样的方法添加到您的帐户模型

def all_options
    profile_option_ids = []
    self.profiles.map{|p| profile_option_ids = profile_option_ids + p.options.pluck("options.id")}
    Option.where("id IN (?) or id IN (?)", self.options, profile_option_ids)
end

所以你只需要打电话

account.all_options