Initializing an existing model with django-mptt service data

Question

Django

I want to do it: I added the missing fields manually, how now to generate data for them based on parent?
Category(models.Model):
name = models.CharField(u'Название', max_length=255, unique=True)
parent = models.ForeignKey('self', verbose_name=u'Родительская категория', null=True, blank=True, related_name='children')


Category(MPTTModel):
...