On Wednesday, February 23, 2011 7:28:06 PM UTC+1, Patrick wrote:
>
> Hi,
>
> i am trying to compare two count-annotations with a simple "greater-
> than" filter like this:
> ResultSequence.objects.annotate(num_result=Count('resultset'),num_part=Count('seminar__participant')).filter(num_result__gt=num_part)
>
>
> i also tried doing it like this:
> ResultSequence.objects.annotate(num_result=Count('resultset')).annotate(num_part=Count('seminar__participant')).filter(num_result__gt=num_part)
>
>
> both ways return "NameError: name 'num_part' is not defined"
>
> it seems to be working nicely when i manually set the last parameter:
> ResultSequence.objects.annotate(num_result=Count('resultset'),num_part=Count('seminar__participant')).filter(num_result__gt=15)
>
>
>
> i dont know if i misunderstand the whole concept of "annotate" or if
> this is just impossible to do..
>
> thanks in advance
> patrick
The problem is not the annotations, but any time you need to use a field
value on the right-hand side. See the documentation on this:
http://docs.djangoproject.com/en/1.2/topics/db/queries/#filters-can-reference-fields-on-the-model
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