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='Exact2').exclude(category__in=bad_categories) On Tue, Sep 14, 2010 at 5:58 PM, Jason <[email protected]> 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 [email protected]. > To unsubscribe from this group, send email to > [email protected]<django-users%[email protected]> > . > 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 [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/django-users?hl=en.
