QuerySet: "if obj in queryset" can be very slow

Hi,

I just discovered, that "if obj in queryset" can be very slow:

queryset=MyModel.objects.all()
obj=MyModel.objects.get(id=319526)

#if obj in queryset: # This is very slow, if queryset is big: All lines from queryset get created to Python objects
# print 'in'

if queryset.filter(id=obj.id): # Fast: Check is done inside DB.
print 'in'

What is the best way to do "if obj in queryset"?

Thomas

--
Thomas Guettler, http://www.thomas-guettler.de/
E-Mail: guettli (*) thomas-guettler + de

--
You received this message because you are subscribed to the Google Groups "Django users" group.
To post to this group, send email to django-users@googlegroups.com.
To unsubscribe from this group, send email to django-users+unsubscribe@googlegroups.com.
For more options, visit this group at http://groups.google.com/group/django-users?hl=en.