I have database entities that I want to change in transaction. For
this I have to create an entity group. However, the entities don't
have any natural parent entity, so I have created a dummy parent
entity. Is there another good way to do this?
Currently I am using the system below. First, I have following data
model.
class Event(db.Model):
date = db.DateTimeProperty(required=True)
name = db.StringProperty(required=True)
I have created a "dummy" parent:
class Parent(db.Model):
pass
Creating parent and defining the parent for the entity (this code is
inside the transaction):
try:
k = db.get("parent_key")
except db.BadKeyError:
k = models.Parent(key_name="parent_key")
k.put()
ancestor_key = k.key()
q = db.GqlQuery('SELECT * WHERE ANCESTOR IS :1', ancestor_key)
# (using the query results here, code clipped)
e = models.Event(date=date, name=name, parent=k)
e.put()
Can I avoid creating this dummy "Parent" model, and satisfy the
"entity group/transaction" requirement in more elegant way?
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