If i have two models:

Model_1.objects.all()

Model_2.objects.all()

Model_1 contains all the elements, Model_2 contains a part of these elements.

How can i find the elements contained in Model_1 but not in Model_2?

I tried:

Model_1.objects.exclude(pk=Model_2.objects.order_by('pk'))

It doesn't work.

CodePudding user response：

You can use in[Django doc.] like:

Model_1.objects.exclude(pk__in=[obj.pk for obj in Model_2.objects.all()])

CodePudding user response：

Generally, 2 models represent two different entities. But if you want to filter the Model_1 based on some property of Model_2 Use exclude and filter as per your requirement.

Model_1.objects.exclude(id__in=Model_2.objects.all()) Model_1.objects.filter(id__in=Model_2.objects.all())