Are you sure you are saving the new QuerySet that gets created by the
filter? I'm guessing you are doing something like:
qs = MyModel.objects.filter(field1="somevalue")
if condition:
qs.filter("someothervalue")
What you need to do is save the value of the second filter() call.
qs = MyModel.objects.filter(field1="somevalue")
if condition:
qs = qs.filter("someothervalue")
filter() returns a new queryset object rather than modifying the
queryset in place.
I usually debug SQL problems by using the
http://github.com/robhudson/django-debug-toolbar or pdb. With pdb you
can put import pdb;pdb.set_trace() where you would like pdb to stop
and it will allow you to debug from there. Simply showing the results
of the queryset usually gives some clues as to what the problem is. In
pdb you can see what sql will get run by running
(Pdb) print queryset.query
pdb's commands are explained here:
http://docs.python.org/library/pdb.html#debugger-commands
On Sat, Sep 25, 2010 at 1:17 PM, ydjango wrote:
> I am stacking filters on queryset. For some reason the second filter
> in stack is not applying and it is not giving any error either. Any
> way to debug what is going on?
>
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Ian
http://www.ianlewis.org/
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