That's an interesting question. I've had two or three instances in the past few months where *it appeared* that a query returned None when it should have returned something (or an error, at least). I'm not sure if this was the case, and do not claim it to be the case:) But in analyzing chains of events, it seemed that this could have been the root cause for certain situations.
That's why I too am interested the answer to this question. johnP On Dec 18, 12:05 pm, z33m <[email protected]> wrote: > Hi, > > Im writing a simple feed crawler using tasks. Feed entries are stored > in Entry model. I use guids to check whether an entry exists or not, > to avoid entries from begin crawled more than once.. But my checking > mechanism seems to be failing.. > > Here is the check function and Entry model that i use.. > > class Entry(db.Model): > guid = db.StringProperty() > title = db.TextProperty() > > @classmethod > def exists(cls, guid): > query = db.Query(cls, keys_only = True) > key = query.filter('guid =', guid).get() > if key: > logging.info('True : %s' % guid) > return True > else: > logging.info('False : %s' % guid) > return False > > and i get strange logs like this > > I 12-18 11:29AM 06.720 True :http://www.techcrunch.com/?p=129969 > I 12-18 11:29AM 06.721 False :http://www.techcrunch.com/?p=129937 > I 12-18 11:29AM 06.722 False :http://www.techcrunch.com/?p=129963 > I 12-18 11:29AM 06.723 False :http://www.techcrunch.com/?p=129883 > .... all other entries are False .... > > I 12-18 11:19AM 00.745 True :http://www.techcrunch.com/?p=129969 > I 12-18 11:19AM 00.754 True :http://www.techcrunch.com/?p=129937 > I 12-18 11:19AM 00.763 True :http://www.techcrunch.com/?p=129963 > I 12-18 11:19AM 00.770 True :http://www.techcrunch.com/?p=129883 > .... all other entries are True .... > > am i doing something wrong? .. how is it possible that the same query > that returned a key 10min ago return None now? -- 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.
