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99 lines
3.8 KiB
Text
99 lines
3.8 KiB
Text
===================================
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Upgrading Django to a newer version
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===================================
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While it can be a complex process at times, upgrading to the latest Django
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version has several benefits:
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* New features and improvements are added.
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* Bugs are fixed.
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* Older version of Django will eventually no longer receive security updates.
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(see :ref:`backwards-compatibility-policy`).
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* Upgrading as each new Django release is available makes future upgrades less
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painful by keeping your code base up to date.
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Here are some things to consider to help make your upgrade process as smooth as
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possible.
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Required Reading
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================
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If it's your first time doing an upgrade, it is useful to read the :doc:`guide
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on the different release processes </internals/release-process>`.
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Afterwards, you should familiarize yourself with the changes that were made in
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the new Django version(s):
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* Read the :doc:`release notes </releases/index>` for each 'final' release from
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the one after your current Django version, up to and including the version to
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which you plan to upgrade.
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* Look at the :doc:`deprecation timeline</internals/deprecation>` for the
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relevant versions.
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Pay particular attention to backwards incompatible changes to get a clear idea
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of what will be needed for a successful upgrade.
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Dependencies
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============
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In most cases it will be necessary to upgrade to the latest version of your
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Django-related dependencies as well. If the Django version was recently
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released or if some of your dependencies are not well-maintained, some of your
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dependencies may not yet support the new Django version. In these cases you may
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have to wait until new versions of your dependencies are released.
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Installation
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============
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Once you're ready, it is time to :doc:`install the new Django version
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</topics/install>`. If you are using virtualenv_ and it is a major upgrade, you
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might want to set up a new environment with all the dependencies first.
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Exactly which steps you will need to take depends on your installation process.
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The most convenient way is to use pip_ with the ``--upgrade`` or ``-U`` flag:
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.. code-block:: console
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$ pip install -U Django
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pip_ also automatically uninstalls the previous version of Django.
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If you use some other installation process, you might have to manually
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:ref:`uninstall the old Django version <removing-old-versions-of-django>` and
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should look at the complete installation instructions.
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.. _pip: http://www.pip-installer.org/
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.. _virtualenv: http://www.virtualenv.org/
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Testing
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=======
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When the new environment is set up, :doc:`run the full test suite
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</topics/testing/overview>` for your application. In Python 2.7+, deprecation
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warnings are silenced by default. It is useful to turn the warnings on so they
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are shown in the test output (you can also use the flag if you test your app
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manually using ``manage.py runserver``):
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.. code-block:: console
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$ python -Wall manage.py test
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After you have run the tests, fix any failures. While you have the release
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notes fresh in your mind, it may also be a good time to take advantage of new
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features in Django by refactoring your code to eliminate any deprecation
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warnings.
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Deployment
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==========
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When you are sufficiently confident your app works with the new version of
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Django, you're ready to go ahead and :doc:`deploy </howto/deployment/index>`
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your upgraded Django project.
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If you are using caching provided by Django, you should consider clearing your
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cache after upgrading. Otherwise you may run into problems, for example, if you
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are caching pickled objects as these objects are not guaranteed to be
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pickle-compatible across Django versions. A past instance of incompatibility
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was caching pickled :class:`~django.http.HttpResponse` objects, either
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directly or indirectly via the :func:`~django.views.decorators.cache.cache_page`
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decorator.
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