Hi folks,
I have some models with a custom Manager that prefetches certain fields:
class PrefetchManager(models.Manager):
def get_queryset(self):
return super().get_queryset()\
.select_related(*self.model.select_fields)\
.prefetch_related(*self.model.prefetch_fields)
class MyModel(models.Model):
foo = models.ForeignKey(Foo)
bars = models.ManyToManyField(Bar, related_name='mymodels')
select_fields = ('foo',)
prefetch_fields = ('bars')
prefetched = PrefetchManager()
This allows the nice and succinct "MyModel.prefetched.filter(...)" to get model
instances with prefetched fields. However, I would also like this to work with
RelatedManager, i.e.:
m = MyModel.objects.get(pk=1)
m.bars.prefetched.filter(...)
to get all Bar connected to m with the prefetched fields I have defined on Bar.
Is there a way to do this? Can I create a custom RelatedManager for 'bars'? I
can rewrite it as:
Bar.prefetched.filter(mymodels=m, ...)
but it feels more awkward.
Thanks,
Erik
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