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64 lines
2.8 KiB
Plaintext
64 lines
2.8 KiB
Plaintext
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==========================
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Django 1.2.5 release notes
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==========================
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Welcome to Django 1.2.5!
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This is the fifth "bugfix" release in the Django 1.2 series,
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improving the stability and performance of the Django 1.2 codebase.
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With two exceptions, Django 1.2.5 maintains backwards compatibility
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with Django 1.2.4, but contain a number of fixes and other
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improvements. Django 1.2.5 is a recommended upgrade for any
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development or deployment currently using or targeting Django 1.2.
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For full details on the new features, backwards incompatibilities, and
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deprecated features in the 1.2 branch, see the :doc:`/releases/1.2`.
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Backwards incompatible changes
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==============================
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FileField no longer deletes files
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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In earlier Django versions, when a model instance containing a
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:class:`~django.db.models.FileField` was deleted,
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:class:`~django.db.models.FileField` took it upon itself to also delete the
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file from the backend storage. This opened the door to several potentially
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serious data-loss scenarios, including rolled-back transactions and fields on
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different models referencing the same file. In Django 1.2.5,
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:class:`~django.db.models.FileField` will never delete files from the backend
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storage. If you need cleanup of orphaned files, you'll need to handle it
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yourself (for instance, with a custom management command that can be run
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manually or scheduled to run periodically via e.g. cron).
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Use of custom SQL to load initial data in tests
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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Django provides a custom SQL hooks as a way to inject hand-crafted SQL
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into the database synchronization process. One of the possible uses
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for this custom SQL is to insert data into your database. If your
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custom SQL contains ``INSERT`` statements, those insertions will be
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performed every time your database is synchronized. This includes the
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synchronization of any test databases that are created when you run a
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test suite.
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However, in the process of testing the Django 1.3, it was discovered
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that this feature has never completely worked as advertised. When
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using database backends that don't support transactions, or when using
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a TransactionTestCase, data that has been inserted using custom SQL
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will not be visible during the testing process.
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Unfortunately, there was no way to rectify this problem without
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introducing a backwards incompatibility. Rather than leave
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SQL-inserted initial data in an uncertain state, Django now enforces
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the policy that data inserted by custom SQL will *not* be visible
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during testing.
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This change only affects the testing process. You can still use custom
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SQL to load data into your production database as part of the syncdb
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process. If you require data to exist during test conditions, you
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should either insert it using :ref:`test fixtures
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<topics-testing-fixtures>`, or using the ``setUp()`` method of your
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test case.
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