ruby-on-rails - 是否可以以编程方式确定在 ruby​​ 中将方法委托(delegate)给哪个对象？

Question

我有一组对象，其中一些具有organization_id属性，另一些则委托(delegate)organization_id。

例如:

class Department
  belongs_to :organization
end
class Program
  belongs_to :department
  delegate :organization_id, to: :department
end

class Role
  belongs_to :organization
end
class UsersRole
  belongs_to :role
  delegate :organization_id, to: :role
end

我想要一种方法来以编程方式确定organization_id被委托(delegate)给哪个对象类，以便我可以执行如下操作

def find_organization_id_source(object)
   object.organization_id.method_im_hoping_exists
end
$ find_organization_id_source(@program)
>> Department
$ find_organization_id_source(@users_role)
>> Role

Answer 1

这是不可能的。从active_support/core_ext/module/delegation.rb的来源可以看出，Rails 创建一个新方法，该方法将在内部调用委托(delegate)方法。