如何从 model_utils 三重选择中获取密钥?

How to get key from model_utils triple Choices?

如果我有一些选择变量:

In [1]: from model_utils import Choices

In [2]: CHOICES = Choices(
   ...:         (1, 'somekey', 'The long title'),
   ...:     )

In [3]: CHOICES[1]
Out[3]: 'The long title'

如何从中检索 somekey 密钥? This answer 对我不起作用。

In [10]: {v: k for k, v in dict(CHOICES).iteritems()}
Out[10]: {'The long title': 1}

解决方法是:

In [11]: {v: k for k, v in CHOICES._identifier_map.items()}
Out[11]: {1: 'somekey'}