#15145: __in is ignored by an excluded query if foo__in is set to an empty iterable ------------------------------------------+--------------------------------- Reporter: melinath | Owner: nobody Status: new | Milestone: Component: Database layer (models, ORM) | Version: SVN Keywords: | Stage: Unreviewed Has_patch: 0 | ------------------------------------------+--------------------------------- Please note that the arguments may be ignored by a filtered query. I haven't tested that.
Assume the following model setup: {{{ #!python from django.db import models from django.contrib.contenttypes.models import ContentType class TestModel1(models.Model): content_type = models.ForeignKey(ContentType) integer = models.PositiveIntegerField() }}} Now run the following code: {{{ #!python >>> from test.models import TestModel1 # or wherever you're keeping it. >>> from django.contrib.contenttypes.models import ContentType >>> integer = 1 >>> ct = ContentType.objects.all()[0] >>> TestModel1.objects.create(integer=integer, content_type=ct) <TestModel1: TestModel1 object> >>> TestModel1.objects.all() [<TestModel1: TestModel1 object>] >>> # This is where it starts getting interesting. >>> TestModel1.objects.exclude(content_type=ct, integer__in=[]) [] }}} According to the documentation, this kind of exclude should exclude all rows where the content type is ct AND integer is in the list. Now since the list is empty, there should be no rows matching the exclusion, so all rows should be returned. Instead, I get an empty queryset. Here's a look at the sql being generated by various queries (Line breaks added for readability): ---- {{{TestModel1.objects.all() or TestModel1.objects.exclude(integer__in=[]) or TestModel1.objects.exclude(content_type__in=[])}}} {{{ #!sql SELECT "test_testmodel1"."id", "test_testmodel1"."content_type_id", "test_testmodel1"."integer" FROM "test_testmodel1" }}} ---- {{{TestModel1.objects.exclude(integer__in=[2])}}} {{{ #!sql SELECT "test_testmodel1"."id", "test_testmodel1"."content_type_id", "test_testmodel1"."integer" FROM "test_testmodel1" WHERE NOT ("test_testmodel1"."integer" IN (2)) }}} ---- {{{TestModel1.objects.exclude(integer__in=[], content_type=ct) or TestModel1.objects.exclude(content_type=ct)}}} {{{ #!sql SELECT "test_testmodel1"."id", "test_testmodel1"."content_type_id", "test_testmodel1"."integer" FROM "test_testmodel1" WHERE NOT ("test_testmodel1"."content_type_id" = 1 ) }}} --- {{{TestModel1.objects.exclude(content_type__in=[], integer=1) or TestModel1.objects.exclude(integer=1)}}} {{{ #!sql SELECT "test_testmodel1"."id", "test_testmodel1"."content_type_id", "test_testmodel1"."integer" FROM "test_testmodel1" WHERE NOT ("test_testmodel1"."integer" = 1 ) --- As you can see, the __in kwarg is being completely ignored. Unfortunately, I can't for the life of me figure out where the bug is happening, or I would try to write a patch. In case it's relevant, I'm using a sqlite3 database. -- Ticket URL: <http://code.djangoproject.com/ticket/15145> Django <http://code.djangoproject.com/> The Web framework for perfectionists with deadlines. -- You received this message because you are subscribed to the Google Groups "Django updates" group. To post to this group, send email to django-updates@googlegroups.com. To unsubscribe from this group, send email to django-updates+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/django-updates?hl=en.