I think that what you want can be accomplished by:
from django.db.models import F
readers = Readers.objects.filter(status=active)
readers.update(sorter=(F('library') + F('book'))
On Wed, Jul 21, 2010 at 19:40, Nick <[email protected]> wrote:
>
> I am trying to loop through a queryset and assign values to a field
> based on other values in that entry.
>
> So something like this
>
> readers = Readers.objects.filter(status=active)
>
> for reader in readers:
> library = reader.library
> book = reader.book
>
> readers.update(sorter="%s%s" % (lirbary, book))
>
> however, when I run the update it assigns the same value to all of the
> readers. I would like this to assign the value to sorter based on
> what their individual library and book choices are.
>
> reader.update return and error "reader has no attribute 'update'"
>
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