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In the url:

https://docs.djangoproject.com/en/dev/intro/tutorial01/#playing-with-the-api

I'm unable to understand this line:

# Display any choices from the related object set -- none so far. >>> q.choice_set.all()

q is an instance of Question, and no where we have defined the attribute choice_set, so how come it is working ?

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Django creates that attribute under the hood for you when you define your models, is part of django to provide that scaffolding to help you with one-to-many and many-to-many relationships, you can read more about it in Accessing related objects.

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