ruby-on-rails - 连接两个事件记录结果(通过连接表)以返回一个新结果

Question

我有以下内容:

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

这是模型

# 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

我希望所有选项都与帐户关联，所有选项都通过配置文件关联，可能在虚拟属性中。

我在那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? 但他们只涉及两个模型，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？

Answer 1

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

所以你只需要调用

account.all_options