Category Hierarchy

我正在使用social-auth-app-django==2.1.0,并试图在我的models.py中创建一个使用用户作为外键的模型。我已经查看了文档,但找不到任何与此相关的内容。所以现在我的models.py看起来是这样的:

class Deck(models):
    deck_name = models.CharField(max_length=30)
    user_id = models.ForeignKey(USER_MODEL ) #what do I type here?

class Card(models):
    card_back = models.CharField(max_length=150)
    card_front = models.CharField(max_length=150)
    card_strength = models.IntegerField()
    card_last_trained = models.DateTimeField()
    deck = models.ForeignKey(Deck, on_delete=models.CASCADE)

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