django order by foreign key count

To achieve this in Django, you can use the annotate function along with the Count aggregation function. Here are the steps:

1. Import the necessary functions: from django.db.models import Count

2. Use the annotate function along with the Count aggregation function to annotate the queryset with the count of the related objects: queryset = ParentModel.objects.annotate(child_count=Count('childmodel'))

3. Now, you can order the queryset by the annotated count field: ordered_queryset = queryset.order_by('child_count')

By following these steps, you can order a Django queryset by the count of related objects using a foreign key relationship.