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 17311,bool(queryset) calls __len__ instead of __nonzero__,Adam Nelson,nobody,"When testing the boolean value of a queryset (i.e. running ""if queryset: ...""), the special attribute __len__ is called which calls count() in the ORM. It should use the special attribute __nonzero__ which would call the exists() method in the ORM.",Uncategorized,closed,"Database layer (models, ORM)",,Normal,invalid,,,Unreviewed,0,0,0,0,0,0