mirror of https://github.com/django/django.git
01b9c3d519
The joins for nested nullable foreign keys were often created as INNER when they should have been OUTER joins. The reason was that only the first join in the chain was promoted correctly. There were also issues with select_related etc. The basic structure for this problem was: A -[nullable]-> B -[nonnull]-> C And the basic problem was that the A->B join was correctly LOUTER, the B->C join not. The major change taken in this patch is that now if we promote a join A->B, we will automatically promote joins B->X for all X in the query. Also, we now make sure there aren't ever join chains like: a LOUTER b INNER c If the a -> b needs to be LOUTER, then the INNER at the end of the chain will cancel the LOUTER join and we have a broken query. Sebastian reported this problem and did also major portions of the patch. |
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README.rst
Django is a high-level Python Web framework that encourages rapid development and clean, pragmatic design. Thanks for checking it out. All documentation is in the "docs" directory and online at http://docs.djangoproject.com/en/dev/. If you're just getting started, here's how we recommend you read the docs: * First, read docs/intro/install.txt for instructions on installing Django. * Next, work through the tutorials in order (docs/intro/tutorial01.txt, docs/intro/tutorial02.txt, etc.). * If you want to set up an actual deployment server, read docs/howto/deployment/index.txt for instructions. * You'll probably want to read through the topical guides (in docs/topics) next; from there you can jump to the HOWTOs (in docs/howto) for specific problems, and check out the reference (docs/ref) for gory details. * See docs/README for instructions on building an HTML version of the docs. Docs are updated rigorously. If you find any problems in the docs, or think they should be clarified in any way, please take 30 seconds to fill out a ticket here: http://code.djangoproject.com/newticket To get more help: * Join the #django channel on irc.freenode.net. Lots of helpful people hang out there. Read the archives at http://django-irc-logs.com/. * Join the django-users mailing list, or read the archives, at http://groups.google.com/group/django-users. To contribute to Django: * Check out http://www.djangoproject.com/community/ for information about getting involved. To run Django's test suite: * Follow the instructions in the "Unit tests" section of docs/internals/contributing/writing-code/unit-tests.txt, published online at https://docs.djangoproject.com/en/dev/internals/contributing/writing-code/unit-tests/#running-the-unit-tests