ndb to_dict方法不包含对象的关键字 [英] ndb to_dict method does not include object's key

问题描述

我利用ndb的to_dict方法将对象的属性转换为python字典。从我所知道的一切来看，这个方法并没有在dict中包含对象的key或parent，如下所示：

https://developers.google.com/appengine/docs/python/ndb/modelclass#Model_to_dict

然而，对于我的情况，我需要在字典中的关键。我的意愿是利用内建方法并将其子类化或类似，而不是创建我自己的to_dict方法。

完成此操作的最佳方法是什么？明显的东西？

供参考：我没有为这个项目利用django，而是直接将python部署到gae。

只要在调用to_dict后将该键添加到字典中，并且是覆盖该方法。

如果您的多个模型不与您的自定义to_dict共享相同的基类，那么我会将其作为混合模式实现。

将to_dict定义为Mixin类的一个方法。你会

  class ModelUtils（object）：
 def to_dict（self）：
 result = super ModelUtils，self）.to_dict（）
 result ['key'] = self.key.id（）＃将键作为字符串获取
返回结果
  
  
 
  
 $ b 
然后使用它。 
 
 
  class MyModel ModelUtils，ndb.Model）：
＃一些属性等... 
  
 
I am leveraging ndb's to_dict method to convert an object's properties into a python dict. From everything I can tell, this method does not include the object's key or parent within the dict as per the documentation: 


https://developers.google.com/appengine/docs/python/ndb/modelclass#Model_to_dict

However for my situation I need the key to be in the dict. My preference would be to leverage the builtin method and subclass it or something similar rather than create my own to_dict method.

What is the best way to accomplish this or am I missing something obvious? Thanks in advance.

FYI: I am not leveraging django for this project but instead straight python deployed up to gae.
解决方案
You're not missing anything ;-)

Just add the key to the dictionary after you call to_dict, and yes override the method. 

If you have multiple models that don't share the same base class with your custom to_dict, I would implement it as a mixin.

to define to_dict as a method of a Mixin class.  you would
class ModelUtils(object):
    def to_dict(self):
        result = super(ModelUtils,self).to_dict()
        result['key'] = self.key.id() #get the key as a string
        return result
Then to use it.
class MyModel(ModelUtils,ndb.Model):
    # some properties etc...


                        
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