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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