I think this is a clearer example to understand entities, key paths
and ancestors.
from google.appengine.api import users
from google.appengine.ext import db
class Parent(db.Model):
pass
class Child(db.Model):
data = db.IntegerProperty(default=0)
user = users.get_current_user()
parent_key_name = user.nickname()
child_key_name = 'child'
parent = Parent(key_name=parent_key_name)
# If we didn't pass key_name the key would not be created until .put()
and the next statement will fail
child = Child(parent=parent, data=55, key_name=child_key_name)
db.put([parent,child])
print child.data
parent_key = db.Key.from_path('Parent', user.nickname())
child = Child.get_by_key_name(child_key_name, parent=parent_key)
print child.data
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