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40 lines
1.3 KiB
Python
40 lines
1.3 KiB
Python
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class SubclassingQuerySet(QuerySet):
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def __getitem__(self, k):
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result = super(SubclassingQuerySet, self).__getitem__(k)
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if isinstance(result, models.Model):
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return result.as_leaf_class()
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else:
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return result
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def __iter__(self):
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for item in super(SubclassingQuerySet, self).__iter__():
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yield item.as_leaf_class()
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class ObjectManager(models.Manager):
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def get_query_set(self):
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return SubclassingQuerySet(self.model)
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def get(self, *args, **kwargs):
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obj = super(ObjectManager, self).get(*args, **kwargs)
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return obj.as_leaf_class()
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class MyObject(models.Model):
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name = models.CharField(max_length=255, verbose_name=_("Name"), blank=True, null=True, editable=True)
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content_type = models.ForeignKey(ContentType, editable=False, null=True)
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objects = ObjectManager()
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def save(self, *args, **kwargs):
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if(not self.content_type):
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self.content_type = ContentType.objects.get_for_model(self.__class__)
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super(Device, self).save(*args, **kwargs)
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def as_leaf_class(self):
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content_type = self.content_type
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model = content_type.model_class()
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if (model == Device):
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return self
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return model.objects.get(id=self.id)
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