[Django]-Django object multiple exclude()

What’s wrong with calling exclude multiple times? Queries are lazy, nothing happens until you try to pull data from it, so there’s no downside to using .exclude() more than once.

You can try this also.

exclude_list = ['A', 'B', 'C']
qs = Foo.objects.exclude(items__in=exclude_list)

You can do it pretty easily with the Q object:

from django.db.models import Q

excludes = None
for tag in ignored_tags:
    q = Q(tag=tag)
    excludes = (excludes and (excludes | q)) or q # makes sure excludes is set properly
set_minus_excluded = Foo.objects.exclude(excludes)

You should also be able to do it dynamically with exclude():

qs = Foo.objects.all()
for tag in ignored_tags:
    qs = qs.exclude(tag=tag)

To improve on Daniel Roseman’s answer I think it would be better to get the values you need directly from the queryset instead of the for loop that could be expensive on large data sets i.e.

names_to_exclude = objects_to_exclude.values_list('name')
Foo.objects.exclude(name__in=names_to_exclude)