That was only returning the F('library') piece of the code for sorter
I rewrote the update like this:
for reader in readers:
reader.sorter = "%s%s" % (reader.library, reader.book)
reader.save()
On Jul 21, 6:08 pm, Santiago Perez <[email protected]> wrote:
> 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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