If I have:

class Task(models.Model):
    subtasks = models.ManyToManyField('Task', null=True, blank=True,
related_name='part_of', symmetrical=False)

how can I check for instances of Task where subtasks or part_of sets
are empty?  E.g something like (syntactically incorrect):

tasks = Task.objects.all()
toptasks = tasks.filter(subtasks.count=0)   or
toptasks = tasks.filter(subtasks__isempty=True)

Are there any:

subtasks__isempty
subtasks__count=
subtasks__contains

type field lookups?

Thanks, Zoltan


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