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Fixed #3615: Added support for loading fixtures with forward references on database backends (such as MySQL/InnoDB) that do not support deferred constraint checking. Many thanks to jsdalton for coming up with a clever solution to this long-standing issue, and to jacob, ramiro, graham_king, and russellm for review/testing. (Apologies if I missed anyone else who helped here.)

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git-svn-id: http://code.djangoproject.com/svn/django/trunk@16590 bcc190cf-cafb-0310-a4f2-bffc1f526a37
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Karen Tracey 2011-08-07 00:43:26 +00:00
parent e3c89346d2
commit be87f0b0ec
16 changed files with 356 additions and 23 deletions
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12
docs/ref/databases.txt
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@ -142,6 +142,18 @@ currently the only engine that supports full-text indexing and searching.
The InnoDB_ engine is fully transactional and supports foreign key references
and is probably the best choice at this point in time.
.. versionchanged:: 1.4
In previous versions of Django, fixtures with forward references (i.e.
relations to rows that have not yet been inserted into the database) would fail
to load when using the InnoDB storage engine. This was due to the fact that InnoDB
deviates from the SQL standard by checking foreign key constraints immediately
instead of deferring the check until the transaction is committed. This
problem has been resolved in Django 1.4. Fixture data is now loaded with foreign key
checks turned off; foreign key checks are then re-enabled when the data has
finished loading, at which point the entire table is checked for invalid foreign
key references and an `IntegrityError` is raised if any are found.
.. _storage engines: http://dev.mysql.com/doc/refman/5.5/en/storage-engines.html
.. _MyISAM: http://dev.mysql.com/doc/refman/5.5/en/myisam-storage-engine.html
.. _InnoDB: http://dev.mysql.com/doc/refman/5.5/en/innodb.html

3
docs/releases/1.4.txt
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@ -235,6 +235,9 @@ Django 1.4 also includes several smaller improvements worth noting:
to delete all files at the destination before copying or linking the static
files.
* It is now possible to load fixtures containing forward references when using
MySQL with the InnoDB database engine.
.. _backwards-incompatible-changes-1.4:
Backwards incompatible changes in 1.4