Version 3 (modified by Luke Plant, 7 years ago) (diff)


Upgrading Notes

Since version 1.0, Django has a policy of API stability. This means that, in general, code you develop against Django 1.0 should continue to work against later versions unchanged. However, we do sometimes make backwards-incompatible changes if they're necessary to resolve bugs.

Before upgrading to any version of Django, you should check all the notes for the version you are upgrading to and for any intermediate versions listed on this page. Changes that are in trunk and not yet in any released version are listed at the top of this page.

For changes made before version 1.0, see BackwardsIncompatibleChanges.


CSRF Protection

There have been large changes to the way that CSRF protection works, detailed in the CSRF documentaton, which has full upgrade notes. The following are the major changes that developers must be aware of:

  • CsrfResponseMiddleware and CsrfMiddleware have been deprecated, and will be removed completely in Django 1.4, in favour of a template tag that should be inserted into forms.
  • All contrib apps use a csrf_protect decorator to protect the view. This requires the use of the csrf_token template tag in the template, so if you have used custom templates for contrib views, (which includes things like a custom login template), you MUST READ THE UPGRADE INSTRUCTIONS to fix those templates.
  • CsrfViewMiddleware is included in MIDDLEWARE_CLASSES by default. This turns on CSRF protection by default, so that views that accept POST requests need to be written to work with the middleware. Instructions on how to do this are found in the CSRF docs.
  • All of the CSRF code has moved from contrib to core (with backwards compatible imports in the old locations, which are deprecated).


LazyObject is an undocumented utility class used for lazily wrapping other objects of unknown type. In Django 1.1 and earlier, it handled introspection in a non-standard way, depending on wrapped objects implementing a public method get_all_members(). Since this could easily lead to name clashes, it has been changed to use the standard method, involving __members__ and __dir__(). If you used LazyObject in your own code, and implemented the get_all_members() method for wrapped objects, you need to make the following changes:

  • If your class does not have special requirements for introspection (i.e. you have not implemented __getattr__() or other methods that allow for attributes not discoverable by normal mechanisms), you can simply remove the get_all_members() method. The default implementation on LazyObject will do the right thing.
  • If you have more complex requirements for introspection, first rename the get_all_members method to __dir__. This is the standard method, from Python 2.6 onwards, for supporting introspection. If you require support for Python < 2.6, add the following code to the class:
        __members__ = property(lambda self: self.__dir__())

Django 1.1

Django 1.1 backwards-incompatible changes

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