连接两个活动记录结果（通过连接表）返回一个新的结果

Question

我有以下几点：

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

下面是模型

# 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 

我想有相关联的所有选项一个帐户和通过配置文件关联的所有选项，可能是一个虚拟属性。

我找到了一个例子，这个问题： How do you concatenate two active record results to return a new result that can further be filtered? 但他们只有两个型号有关，在我的情况下，我们的故事连接表。

任何想法，如何写这样的虚拟属性？

Answer 1

如何将这样的方法给您的客户模型

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