Hi,
I have developed some applications in web2py, and 2 are running
currently in gae, but now i have serious problem.
My current project is a social application, and when i design
(example) the tables to make an user follow the actions other user
(twitter like) I find that many-to-many relationships in app-engine
are not easily supported.
>From my understanding using the tools present in web2py right i would
need to do a lot of processing in memory, an that would hurt
performance greatly.
The pattern proposed by app store developers uses lists and "parent"
relationship:
class Message(db.Model):
sender = db.StringProperty()
body = db.TextProperty()
class MessageIndex(db.Model):
receivers = db.StringListProperty()
indexes = MessageIndex.all(keys_only = True).filter('receivers = ', user_id)
keys = [k.parent() for k in indexes)
messages = db.get(keys)
For using that pattern in web2py I would need a method for specifying
the parent of a model instance. Can I specify that relationship using
any method I don't know? If not, would it be hard to implement?
Thanks in advance!
