Robert, Can you elaborate on 'cross entity group transactions'?
Thanks, Will On Tue, Jan 25, 2011 at 11:53 AM, Robert Kluin <[email protected]>wrote: > Use two kinds, one for the actual user info and the other for the > uniqueness check. Implement 'cross entity group transactions' using > some type of 'roll-forward' semantics so that you can continue > creating / updating the proper user entity should an error occur. > > > > > Robert > > > > > > > > On Mon, Jan 24, 2011 at 19:59, Dave Peck <[email protected]> wrote: > > I have a User model and I've placed the email address in the key_name. > > This makes it easy to ensure uniqueness without race conditions. > > > > _Changing_ emails becomes a problem. It involves creating a new > > account and switching all references. Which makes me wonder if the > > email address really should be key. > > > > How have others approached this simple problem? You want transactions > > on all sides if you can get them... > > > > Cheers, > > Dave > > > > -- > > 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]<google-appengine%[email protected]> > . > > For more options, visit this group at > http://groups.google.com/group/google-appengine?hl=en. > > > > > > -- > 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]<google-appengine%[email protected]> > . > For more options, visit this group at > http://groups.google.com/group/google-appengine?hl=en. > > -- 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.
