仅当不存在子代时，Django MPTT过滤器

Question

So I am using MPTT for a Category model in Django, and I was wondering if there is a way to filter a Category if there is no child .

models.py:

class Category(MPTTModel, TimeStampedModel):
    title = models.CharField(max_length=75)
    parent = TreeForeignKey('self', null=True, blank=True, on_delete=models.SET_NULL, related_name='children', db_index=True)

Categories example in DB:

Games > Nintendo > Nintendo 64
Games > Microsoft > Xbox One

I want to be able to run a command like this:

Category.objects.all().has_no_children()

Hoping that it would return [Nintendo 64, Xbox One]

Answer 1

You are trying to get what is called leaves . This should help you:

Category.objects.filter(lft=F('rght')-1)