Hello!
I'm using the "nested set" abstraction to store some tree data in a
Django model. So the model class looks like
class TreeNode(models.Model):
value = models.CharField(maxlength=10)
leftVisit = models.IntegerField(primary_key=True)
rightVisit = models.IntegerField(db_index=True)
def insertChild(self, **kwargs):
"""Add a child node to this node."""
cursor = conection.cursor()
# do some magic, potentially updating many objects using the
cursor
...
return child
def getPathToRoot(self):
"""Returns the path of nodes to the root node"""
return AltStep.objects.filter(leftVisit__lt=self.leftVisit,
rightVisit__gt=self.rightVisit)
This all works fine, but, in this abstraction, an insert into the tree
updates everything to the "right" of it. This means that any python
objects I have in memory for this model are now dirty and need to be
updated from the database. Is there a way I can ask objects to refresh
themselves from the database?
Thanks,
Lars
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