def __get__(self, instance, owner):
if instance is None:
return self
value = instance._data.get(self.name)
self._auto_dereference = instance._fields[self.name]._auto_dereference
if self._auto_dereference and isinstance(value, (dict, SON)):
dereferenced = self.dereference(value)
if dereferenced is None:
raise DoesNotExist('Trying to dereference unknown document %s' % value)
else:
instance._data[self.name] = dereferenced
return super(GenericReferenceField, self).__get__(instance, owner)
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