Backwards paging is currently supported, you can see this ndb example of how to do it: https://developers.google.com/appengine/docs/python/ndb/queries#cursors
On Wed, Oct 10, 2012 at 12:29 AM, Matija <[email protected]> wrote: > Hey, > is there any news about backwards cursor? Two years ago they were > 'presented' in next gen queries google io presentation. We did get some > features but not backwards cursors. > > Matija > > > On Tuesday, October 9, 2012 4:14:29 AM UTC+2, Takashi Matsuo (Google) > wrote: > >> >> Hi James, >> >> First of all, you are right. You should always use cursors whenever >> possible. >> >> We used to offer only 'offset' for going back and forth within query >> results before 1.3.1 release. >> http://googleappengine.**blogspot.jp/2010/02/app-** >> engine-sdk-131-including-**major.html<http://googleappengine.blogspot.jp/2010/02/app-engine-sdk-131-including-major.html> >> >> Thus there is a lot of code with the 'offset' still running in the >> production for a historical reason. It is hard for us to just kill this >> feature. >> However, as you guys noticed, please use cursors whenever you can. >> >> If you want us to improve our documentation, maybe you can file a bug on >> our issue tracker with more concret suggestions rather than ranting with >> the caps. >> >> Thanks, >> >> -- Takashi >> >> >> On Tue, Oct 9, 2012 at 8:09 AM, James Gilliam <[email protected]> wrote: >> >>> You hurl insults while asserting offset has some usefulness without any >>> support. So, give me an example of how it is anything but >>> mathematically pathological. >>> >>> On Monday, October 8, 2012 11:07:45 AM UTC-7, James Gilliam wrote: >>>> >>>> I discovered that GAE charges you for skipping entities in Datastore >>>> with OFFSET. So, if you want to retrieve 1 record at offset 10, you pay >>>> for reading 11. >>>> >>>> This makes OFFSET expensive and WORTHLESS ... >>>> >>>> Offset should never be mentioned in the documentation without a >>>> footnote that says you can't afford to use it. >>>> >>>> Kinda pissed about this. >>>> >>> -- >>> You received this message because you are subscribed to the Google >>> Groups "Google App Engine" group. >>> To view this discussion on the web visit https://groups.google.com/d/** >>> msg/google-appengine/-/**Kd0I90rUVLcJ<https://groups.google.com/d/msg/google-appengine/-/Kd0I90rUVLcJ> >>> . >>> >>> To post to this group, send email to google-a...@googlegroups.**com. >>> To unsubscribe from this group, send email to google-appengi...@** >>> googlegroups.com. >>> >>> For more options, visit this group at http://groups.google.com/** >>> group/google-appengine?hl=en<http://groups.google.com/group/google-appengine?hl=en> >>> . >>> >> >> >> >> -- >> Takashi Matsuo | Developers Advocate | [email protected] >> >> -- > You received this message because you are subscribed to the Google Groups > "Google App Engine" group. > To view this discussion on the web visit > https://groups.google.com/d/msg/google-appengine/-/Ww6zx2oKOxMJ. > > 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. > -- 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.
