              # Accessed on a class, not an instance
              return self
  
          # Getting the value of the field.
          geo_value = instance.__dict__[self._field.attname]
  
          if isinstance(geo_value, self._klass):
              geo_obj = geo_value
          elif (geo_value is None) or (geo_value == ''):
              geo_obj = None
 
</s> remove         non_deferred_model = instance._meta.proxy_for_model
        opts = non_deferred_model._meta

        assert instance is not None
 </s> add         if instance is None:
            return self
        opts = instance._meta </s> remove         elif not force_insert and self._deferred and using == self._state.db:
 </s> add         elif not force_insert and deferred_fields and using == self._state.db: </s> remove # This function is needed because data descriptors must be defined on a class
# object, not an instance, to have any effect.

def deferred_class_factory(model, attrs):
    """
    Returns a class object that is a copy of "model" with the specified "attrs"
    being replaced with DeferredAttribute objects. The "pk_value" ties the
    deferred attributes to a particular instance of the model.
    """
    if not attrs:
        return model
    opts = model._meta
    # Never create deferred models based on deferred model
    if model._deferred:
        # Deferred models are proxies for the non-deferred model. We never
        # create chains of defers => proxy_for_model is the non-deferred
        # model.
        model = opts.proxy_for_model
    # The app registry wants a unique name for each model, otherwise the new
    # class won't be created (we get an exception). Therefore, we generate
    # the name using the passed in attrs. It's OK to reuse an existing class
    # object if the attrs are identical.
    name = "%s_Deferred_%s" % (model.__name__, '_'.join(sorted(attrs)))
    name = utils.truncate_name(name, 80, 32)

    try:
        return opts.apps.get_model(model._meta.app_label, name)

    except LookupError:

        class Meta:
            proxy = True
            apps = opts.apps
            app_label = opts.app_label

        overrides = {attr: DeferredAttribute(attr, model) for attr in attrs}
        overrides["Meta"] = Meta
        overrides["__module__"] = model.__module__
        overrides["_deferred"] = True
        return type(str(name), (model,), overrides)


 </s> add  </s> remove     def __set__(self, instance, value):
        """
        Deferred loading attributes can be set normally (which means there will
        never be a database lookup involved.
        """
        instance.__dict__[self.field_name] = value

 </s> add 
        try:
            geo_value = instance.__dict__[self._field.attname]
        except KeyError:
            geo_value = super(SpatialProxy, self).__get__(instance, cls)
              # Accessed on a class, not an instance
              return self
  
          # Getting the value of the field.
        try:
            geo_value = instance.__dict__[self._field.attname]
        except KeyError:
            geo_value = super(SpatialProxy, self).__get__(instance, cls)
  
          if isinstance(geo_value, self._klass):
              geo_obj = geo_value
          elif (geo_value is None) or (geo_value == ''):
              geo_obj = None
keep keep keep keep replace keep keep keep keep keep
 Fixed #26207 -- Replaced dynamic classes with non-data descriptors for deferred instance loading. 
django/contrib/gis/db/models/proxy.py