id	summary	reporter	owner	description	type	status	component	version	severity	resolution	keywords	cc	stage	has_patch	needs_docs	needs_tests	needs_better_patch	easy	ui_ux
13137	GenericForeignKey does not allow content type PK 0	Justin de Vesine	woodlee	"The GenericForeignKey system does not properly recognize when a ContentType ID 0 is linked to.  In django/contrib/contenttypes/generic.py, two specific instances are checking for ""if primarykey:"" rather than ""if primarykey is not None:"".

This specifically came up in our environment because we are matching the ContentType ids to our legacy database content type ids, which start at 0 rather than 1.

To reproduce, rename attached foobar_models.py to models.py and place in an app named 'foobar', then follow the directions in comments at the bottom of the models file.

The attached proposed patch changes these two if statements to ""is not None"", which I believe is more correctly in the spirit of the code as well as allowing this functional case."	Bug	closed	contrib.contenttypes	dev	Normal	fixed	contenttype genericforeignkey		Accepted	1	0	0	0	0	0