    Web servers already implement this behavior. Responses retrieved using the
    Django test client continue to have these "response fixes" applied.
  
  .. _deprecated-features-1.10:
  
  Features deprecated in 1.10
  ===========================
 
</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 ``field_names`` are in the same order as the ``values``, so it is possible to
use ``cls(**(zip(field_names, values)))`` to instantiate the object. If all
of the model's fields are present, then ``values`` are guaranteed to be in
the order ``__init__()`` expects them. That is, the instance can be created
by ``cls(*values)``. It is possible to check if all fields are present by
consulting ``cls._deferred`` - if ``False``, then all fields have been loaded
from the database.
 </s> add ``field_names`` are in the same order as the ``values``. If all of the model's
fields are present, then ``values`` are guaranteed to be in the order
``__init__()`` expects them. That is, the instance can be created by
``cls(*values)``. If any fields are deferred, they won't appear in
``field_names``. In that case, assign a value of ``django.db.models.DEFERRED``
to each of the missing fields. </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 
* ``Model.__init__()`` now receives ``django.db.models.DEFERRED`` as the value
  of deferred fields.

* The ``Model._deferred`` attribute is removed as dynamic model classes when
  using ``QuerySet.defer()`` and ``only()`` is removed.

    Web servers already implement this behavior. Responses retrieved using the
    Django test client continue to have these "response fixes" applied.
  
* ``Model.__init__()`` now receives ``django.db.models.DEFERRED`` as the value
  of deferred fields.

* The ``Model._deferred`` attribute is removed as dynamic model classes when
  using ``QuerySet.defer()`` and ``only()`` is removed.

  .. _deprecated-features-1.10:
  
  Features deprecated in 1.10
  ===========================
keep keep add keep keep keep keep
 Fixed #26207 -- Replaced dynamic classes with non-data descriptors for deferred instance loading. 
docs/releases/1.10.txt