如何为ActiveRecord多态关联编写Rspec测试

Question

是否有人找到了为ActiveRecord多态关联编写rspec示例的方法？

我习惯使用Thoughtbot的shoulda匹配，但我认为多态的超出了它的范围？

为了清楚起见，我的模型会有类似的模式：

class Person < ActiveRecord::Base
  attr_accessible :name

  has_one :address, as: :location_data_source

  accepts_nested_attributes_for :address
end

class Company < ActiveRecord::Base
  attr_accessible :name

  has_one :address, as: :location_data_source

  accepts_nested_attributes_for :address
end

class Address < ActiveRecord::Base
  attr_accessible :street, :city

  belongs_to :location_data_source, polymorphic: true
end