Hi to all!

I have a model

class Task(models.Model):
    title = models.CharField(max_length = 250)
    subtasks = models.ManyToManyField('Task', null=True, blank=True)


The problem is that when I add subtask to task, task is also added to
subtask, look at the following code to see what I mean.

>>> subtask = Task.objects.create(title='subtask')
>>> task = Task.objects.create(title='task')

>>> task.subtasks.add(subtask)

>>> task.subtasks.all()
[<Task: subtask>]
>>> subtask.subtasks.all()
[<Task: task>]

But the thing I want it only to add subtask to task, not vice versa.
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