Thanks.howerver, that is not i want. I just want counter to record MyModel's number,so when a new entity is saved the counter +1, and the above two operation should be in transaction. And I just dont know how
On Jun 28, 9:16 pm, Emil Kjer <emil.k...@gmail.com> wrote: > You need to reach the incremental method on the db object from a > webapp.RequestHandler. From the > sourcehttp://google-app-engine-samples.googlecode.com/svn/trunk/sharded-cou... > the counter-main-class is defined as: > > import generalcounter > import simplecounter > > class CounterHandler(webapp.RequestHandler): > """Handles displaying the values of the counters > and requests to increment either counter. > """ > > def get(self): > template_values = { > 'simpletotal': simplecounter.get_count(), > 'generaltotal': generalcounter.get_count('FOO') > } > template_file = os.path.join(os.path.dirname(__file__), > 'counter.html') > self.response.out.write(template.render(template_file, > template_values)) > > def post(self): > counter = self.request.get('counter') > if counter == 'simple': > simplecounter.increment() > else: > generalcounter.increment('FOO') > self.redirect("/") > > So just make a post like the example eg. the simple counter: > <form action="" method="post"> > <p><input type="hidden" name="counter" value="simple" /></p> > > <p><input type="submit" value="Increment Simple" /></p> > </form> > > And rewrite your class to your purpose by following the counter- > example. If it to any help this i the > sourcehttp://google-app-engine-samples.googlecode.com/svn/trunk/sharded-cou... > > Did that make sence? :) > > On Jun 28, 8:13 am, xiaojay <xiao...@gmail.com> wrote: > > > Hi guys, > > > I am new to gae and knew count() only return the exact num only when > > the num is less than 1000 > > and I read the article about sharded counter > > here:http://code.google.com/intl/en/appengine/articles/sharding_counters.html. > > > so I start to use it in my own project > > like this: > > > import counter > > class MyModel(db.Model): > > name = db.StringProperty() > > > #overwrite put so when new one is saved, counter + 1 > > def put(self): > > def txn(): > > counter.increment('MyModel') > > return super(Mymodel, self).put() > > return db.run_in_transaction(txn) > > > howerver, when I test this code, get a error "BadRequestError: Nested > > transactions are not supported. > > " > > I know why. howerver, i can not figure out how to go through it > > beacuse i want save a entity and increase counter in a transaction > > > any ideas? > > 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 google-appengine@googlegroups.com To unsubscribe from this group, send email to google-appengine+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en -~----------~----~----~----~------~----~------~--~---
