獲取與模型關聯嵌套的屬性

Question

我想寫我在哪裏尋找獲取與模型

對於如

class Category < ActiveRecord::Base 

accepts_nested_attributes_for :devices, :books 

#other association and code is not written here 

end 

相關的嵌套屬性的更清潔的方式測試案例之一我預計

$ Category.get_nested_attributes #this is a dummy method 
$ ["devices","books"] #this is the return i expect 

是否有任何已有的幫助方法？如果是，請讓我知道。 :)

感謝

Answer 1

根據軌道源代碼（https://github.com/rails/rails/blob/master/activerecord/lib/active_record/nested_attributes.rb#L269），該代碼應工作：

1.9.3p327 :002 > User.nested_attributes_options.keys 
=> [:subscriptions]