Wow - that's *exactly* the way I ended up doing it! It took me a full working day to figure it out though. I'll post up a snippet when I'm at work tomorrow. Basically the same thing except filtering with pk and not name- I looped through the exact matches and then excluded the rest.
On Sep 15, 8:29 am, Alec Shaner <asha...@chumpland.org> wrote: > Try this: > > I'm assuming you define Article.category as a ManyToMany field? I also > assumed for the example that Category has a name field. > > # Build a queryset of all categories not in desired set, e.g., 'Exact1' and > 'Exact2' > bad_categories = Category.objects.exclude(category_name__in=['Exact1', > 'Exact2']) > # Filter your exact categories, then exclude the bad ones > Article.objects.filter(category__name='Exact1').filter(category__name='Exac > t2').exclude(category__in=bad_categories) > > > > On Tue, Sep 14, 2010 at 5:58 PM, Jason <goodri...@gmail.com> wrote: > > Say for example you have two models: > > > Article > > Category > > > Articles can have multiple categories. > > > How would you go about finding the Articles that contain only a > > certain set of Categories? > > > The 'in' operator doesn't do me any good. Excludes look like they are > > needed... > > > I'm in a situation where quickly sorting by SETS of categories is > > needed and I'm having a tough time. My database programming skills are > > pretty weak. > > > I'm thinking of making an intermediate model called CategorySets. > > > Articles would then have a relationship to a CategorySet and I can > > sort very easily on this. > > > (note my actual project isn't using Articles but it's quicker to > > explain in these terms). > > > Does anyone have any tips or experience here? > > > -- > > You received this message because you are subscribed to the Google Groups > > "Django users" group. > > To post to this group, send email to django-us...@googlegroups.com. > > To unsubscribe from this group, send email to > > django-users+unsubscr...@googlegroups.com<django-users%2bunsubscr...@google > > groups.com> > > . > > For more options, visit this group at > >http://groups.google.com/group/django-users?hl=en. -- You received this message because you are subscribed to the Google Groups "Django users" group. To post to this group, send email to django-us...@googlegroups.com. To unsubscribe from this group, send email to django-users+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/django-users?hl=en.
