Hi,
I'm having trouble implementing a certain table design in GAE.
Consider the following Model:
class Group(db.Model):
name = db.StringProperty()
description = db.TextProperty()
password = db.StringProperty()
creator = db.ReferenceProperty(User)
created = db.DateTimeProperty(auto_now=True)
class GroupMembers(db.Model):
user = db.ReferenceProperty(User)
group = db.ReferenceProperty(Group)
admin = db.BooleanProperty()
class Event(db.Model):
date = db.DateTimeProperty(required=True)
creator = db.ReferenceProperty(User)
group = db.ReferenceProperty(Group)
location = db.StringProperty(required=True)
title = db.StringProperty(required=True)
duration = db.IntegerProperty()
Now say I wanted to list all events for all the groups which the user
belongs to. Normally this would be easily solved in SQL:
SELECT e.*
FROM GroupMembers gm, Event e
WHERE gm.group = e.group
AND gm.user = <some_user_id>
Of course I could get a list of group memberships for a user in one
call, then loop through these groups, get all events for each and
combine in a final list. But that is an ugly way of doing it and would
result in 1 + (N memberships) calls to datastore. Is there any clean
way of solving this in GAE?
Thank you
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