gistfile1.py

class Node(models.Model):
  parent = models.ForeignKey("self", blank=True, null=True)

reversion.register(Node)
  
with reversion.create_revision():
  p = Node.objects.create()  # Version saved.
  
with reversion.create_revision():
  c = Node.objects.create()  # Version saved.
  
with reversion.create_revision():
  c.parent = p
  c.save()  # Version saved.
  
with reversion.create_revision():
  p.children.clear()  # Version NOT saved.