For django-model-utils, how can `select_subclasses()` be applied to fields of an object?

问题

I have some models like this:

class Container(models.Model):
    pass

class Parent(models.Model):
    container = models.ForeignKey(Container, related_name='items')
    pass

class Child(Parent):
    pass

class RedHeadedStepChild(Parent):
    pass

Is it possible to use select_subclasses() to prefetch fields in the container? I want to do something like this:

qs = Container.objects.all().prefetch_related('items')\
     .select_subclasses() # <---

So that the items related field of each Container is retrieved in each of its respective subclass types.

回答1:

What about:

Container.objects.prefetch_related(
    Prefetch('items', Parent.objects.select_subclasses())
)

来源：https://stackoverflow.com/questions/29014085/for-django-model-utils-how-can-select-subclasses-be-applied-to-fields-of-an