[Django] #20242: Django queryset 'in' operator fails on first call

[Django]

#20242: Django queryset 'in' operator fails on first call
----------------------------------------------+--------------------
     Reporter:  anonymous                     |      Owner:  nobody
         Type:  Bug                           |     Status:  new
    Component:  Database layer (models, ORM)  |    Version:  1.5
     Severity:  Normal                        |   Keywords:
 Triage Stage:  Unreviewed                    |  Has patch:  0
Easy pickings:  0                             |      UI/UX:  0
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 When using the 'in' operator on a queryset, the first time the call is
 made it fails. If 'prefetch_related' is removed and 'all' is used instead
 then the problem is gone.

 {{{
 from django.db import models


 class Category(models.Model):
     name = models.CharField(max_length=100)


 class Project(models.Model):
     categories = models.ManyToManyField(Category, related_name='projects')


 category_list = Category.objects.prefetch_related('projects')


 print category_list # [<Category: Category object>, <Category: Category
 object>]
 print category_list[0] in category_list # False
 print category_list[0] in category_list # True
 }}}

-- 
Ticket URL: <https://code.djangoproject.com/ticket/20242>
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