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256 lines
9.5 KiB
Plaintext
=================================
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Django version 0.96 release notes
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=================================
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Welcome to Django 0.96!
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The primary goal for 0.96 is a cleanup and stabilization of the features
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introduced in 0.95. There have been a few small `backwards-incompatible
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changes`_ since 0.95, but the upgrade process should be fairly simple
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and should not require major changes to existing applications.
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However, we're also releasing 0.96 now because we have a set of
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backwards-incompatible changes scheduled for the near future. Once
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completed, they will involve some code changes for application
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developers, so we recommend that you stick with Django 0.96 until the
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next official release; then you'll be able to upgrade in one step
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instead of needing to make incremental changes to keep up with the
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development version of Django.
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Backwards-incompatible changes
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==============================
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The following changes may require you to update your code when you switch from
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0.95 to 0.96:
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``MySQLdb`` version requirement
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-------------------------------
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Due to a bug in older versions of the ``MySQLdb`` Python module (which
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Django uses to connect to MySQL databases), Django's MySQL backend now
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requires version 1.2.1p2 or higher of ``MySQLdb``, and will raise
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exceptions if you attempt to use an older version.
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If you're currently unable to upgrade your copy of ``MySQLdb`` to meet
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this requirement, a separate, backwards-compatible backend, called
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"mysql_old", has been added to Django. To use this backend, change
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the ``DATABASE_ENGINE`` setting in your Django settings file from this::
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DATABASE_ENGINE = "mysql"
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to this::
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DATABASE_ENGINE = "mysql_old"
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However, we strongly encourage MySQL users to upgrade to a more recent
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version of ``MySQLdb`` as soon as possible, The "mysql_old" backend is
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provided only to ease this transition, and is considered deprecated;
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aside from any necessary security fixes, it will not be actively
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maintained, and it will be removed in a future release of Django.
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Also, note that some features, like the new ``DATABASE_OPTIONS``
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setting (see the :doc:`databases documentation </ref/databases>` for details),
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are only available on the "mysql" backend, and will not be made available for
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"mysql_old".
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Database constraint names changed
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---------------------------------
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The format of the constraint names Django generates for foreign key
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references have changed slightly. These names are generally only used
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when it is not possible to put the reference directly on the affected
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column, so they are not always visible.
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The effect of this change is that running ``manage.py reset`` and
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similar commands against an existing database may generate SQL with
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the new form of constraint name, while the database itself contains
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constraints named in the old form; this will cause the database server
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to raise an error message about modifying nonexistent constraints.
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If you need to work around this, there are two methods available:
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1. Redirect the output of ``manage.py`` to a file, and edit the
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generated SQL to use the correct constraint names before
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executing it.
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2. Examine the output of ``manage.py sqlall`` to see the new-style
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constraint names, and use that as a guide to rename existing
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constraints in your database.
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Name changes in ``manage.py``
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-----------------------------
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A few of the options to ``manage.py`` have changed with the addition of fixture
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support:
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* There are new ``dumpdata`` and ``loaddata`` commands which, as
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you might expect, will dump and load data to/from the
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database. These commands can operate against any of Django's
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supported serialization formats.
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* The ``sqlinitialdata`` command has been renamed to ``sqlcustom`` to
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emphasize that ``loaddata`` should be used for data (and ``sqlcustom`` for
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other custom SQL -- views, stored procedures, etc.).
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* The vestigial ``install`` command has been removed. Use ``syncdb``.
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Backslash escaping changed
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--------------------------
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The Django database API now escapes backslashes given as query parameters. If
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you have any database API code that matches backslashes, and it was working before
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(despite the lack of escaping), you'll have to change your code to "unescape" the
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slashes one level.
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For example, this used to work::
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# Find text containing a single backslash
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MyModel.objects.filter(text__contains='\\\\')
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The above is now incorrect, and should be rewritten as::
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# Find text containing a single backslash
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MyModel.objects.filter(text__contains='\\')
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Removed ENABLE_PSYCO setting
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----------------------------
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The ``ENABLE_PSYCO`` setting no longer exists. If your settings file includes
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``ENABLE_PSYCO`` it will have no effect; to use Psyco_, we recommend
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writing a middleware class to activate it.
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.. _psyco: http://psyco.sourceforge.net/
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What's new in 0.96?
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===================
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This revision represents over a thousand source commits and over four hundred
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bug fixes, so we can't possibly catalog all the changes. Here, we describe the
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most notable changes in this release.
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New forms library
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-----------------
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``django.newforms`` is Django's new form-handling library. It's a
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replacement for ``django.forms``, the old form/manipulator/validation
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framework. Both APIs are available in 0.96, but over the next two
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releases we plan to switch completely to the new forms system, and
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deprecate and remove the old system.
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There are three elements to this transition:
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* We've copied the current ``django.forms`` to
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``django.oldforms``. This allows you to upgrade your code *now*
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rather than waiting for the backwards-incompatible change and
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rushing to fix your code after the fact. Just change your
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import statements like this::
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from django import forms # 0.95-style
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from django import oldforms as forms # 0.96-style
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* The next official release of Django will move the current
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``django.newforms`` to ``django.forms``. This will be a
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backwards-incompatible change, and anyone still using the old
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version of ``django.forms`` at that time will need to change
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their import statements as described above.
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* The next release after that will completely remove
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``django.oldforms``.
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Although the ``newforms`` library will continue to evolve, it's ready for use
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for most common cases. We recommend that anyone new to form handling skip the
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old forms system and start with the new.
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For more information about ``django.newforms``, read the :doc:`newforms
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documentation </topics/forms/index>`.
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URLconf improvements
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--------------------
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You can now use any callable as the callback in URLconfs (previously, only
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strings that referred to callables were allowed). This allows a much more
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natural use of URLconfs. For example, this URLconf::
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from django.conf.urls.defaults import *
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urlpatterns = patterns('',
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('^myview/$', 'mysite.myapp.views.myview')
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)
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can now be rewritten as::
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from django.conf.urls.defaults import *
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from mysite.myapp.views import myview
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urlpatterns = patterns('',
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('^myview/$', myview)
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)
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One useful application of this can be seen when using decorators; this
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change allows you to apply decorators to views *in your
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URLconf*. Thus, you can make a generic view require login very
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easily::
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from django.conf.urls.defaults import *
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from django.contrib.auth.decorators import login_required
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from django.views.generic.list_detail import object_list
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from mysite.myapp.models import MyModel
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info = {
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"queryset" : MyModel.objects.all(),
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}
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urlpatterns = patterns('',
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('^myview/$', login_required(object_list), info)
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)
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Note that both syntaxes (strings and callables) are valid, and will continue to
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be valid for the foreseeable future.
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The test framework
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------------------
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Django now includes a test framework so you can start transmuting fear into
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boredom (with apologies to Kent Beck). You can write tests based on
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:mod:`doctest` or :mod:`unittest` and test your views with a simple test client.
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There is also new support for "fixtures" -- initial data, stored in any of the
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supported :doc:`serialization formats </topics/serialization>`, that will be
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loaded into your database at the start of your tests. This makes testing with
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real data much easier.
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See :doc:`the testing documentation </topics/testing/index>` for the full details.
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Improvements to the admin interface
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-----------------------------------
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A small change, but a very nice one: dedicated views for adding and
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updating users have been added to the admin interface, so you no
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longer need to worry about working with hashed passwords in the admin.
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Thanks
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======
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Since 0.95, a number of people have stepped forward and taken a major
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new role in Django's development. We'd like to thank these people for
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all their hard work:
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* Russell Keith-Magee and Malcolm Tredinnick for their major code
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contributions. This release wouldn't have been possible without them.
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* Our new release manager, James Bennett, for his work in getting out
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0.95.1, 0.96, and (hopefully) future release.
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* Our ticket managers Chris Beaven (aka SmileyChris), Simon Greenhill,
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Michael Radziej, and Gary Wilson. They agreed to take on the monumental
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task of wrangling our tickets into nicely cataloged submission. Figuring
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out what to work on is now about a million times easier; thanks again,
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guys.
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* Everyone who submitted a bug report, patch or ticket comment. We can't
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possibly thank everyone by name -- over 200 developers submitted patches
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that went into 0.96 -- but everyone who's contributed to Django is listed
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in AUTHORS_.
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.. _AUTHORS: https://code.djangoproject.com/browser/django/trunk/AUTHORS
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