Hi, I'm relatively new to GAE so I'm not sure if I'm overlooking
something relatively simple, but some help would be greatly
appreciated:
I'm working on an app where users can add others as contacts. To do
this, I have a User model and a Contact model:
class User(db.Model):
username = db.StringProperty(required=True)
firstname = db.StringProperty()
lastname = db.StringProperty()
email = db.EmailProperty(required=True)
address = db.PostalAddressProperty(required=False)
password = db.StringProperty(required=True)
class Contact(db.Model):
contacter =
db.ReferenceProperty(User,required=True,collection_name='contacters')
contactee =
db.ReferenceProperty(User,required=True,collection_name='contactees')
accepted = db.BooleanProperty(required=True,default=False)
The relationships are unidirectional, so User A (contacter) can
request User B (contactee) as a contact and User B must then accept
User A. User A now has User B added as a contact, whereas User B
doesn't see anything different. To get a list of contacts for User A,
I'm using the back-reference property.
user = db.get(self.session['userkey']) //uses other info to get fetch
a User object
...
contactList = [] //blank array of contacts
if hasattr(user,'contacters'):
for contact in user.contacters: //loops through all Contact objects
that refer to the current user as a contacter
if contact.accepted == True:
contactList.append(contact.contactee)
The rest of the code is arbitrary, but in short I then loop through
the contactList array and print out the users for the "contacts" page.
The problem here is that it only works sporadically. Quite
astonishingly, I sometimes refresh the page and the contacts it finds
will disappear completely. There aren't any errors being logged, and
when I come back the next day or a few hours later it's back again. I
have an autocomplete script on a different page that queries another
class to get a list of matching contacts. It uses a similar back-
reference property, and this also works sporadically.
Are there any known issues / caching-features that I'm not aware of,
that might be causing this? Are back-references not the right way to
go about this? Thanks in advance!
--
You received this message because you are subscribed to the Google Groups
"Google App Engine" group.
To post to this group, send email to [email protected].
To unsubscribe from this group, send email to
[email protected].
For more options, visit this group at
http://groups.google.com/group/google-appengine?hl=en.
