Perhaps you may keep it in another model.
class BigModel(db.Model):
...
class KeyModel(db.Model):
key = db.ReferenceProperty(BigModel)
# do below in a transaction
bigEntity = BigModel()
...
bigEntity.put()
KeyModel(key=bigEntity.key()).put
2009/4/17 mbac...@googlemail.com <mbac...@googlemail.com>
>
> Thanks Jeff. :)
>
> 风笑雪, memcache is no solution in this case, but thanks anyway.
>
> I also want to keep the overhead as low as possible, because I am
> already storing a lot of text data inside the datastore. Therefore I
> don't want to have another Kind that just handles the list of
> available links if the information is already in the original Kind.
>
> Best regards,
> Marc
>
> On 15 Apr., 23:40, "Jeff S (Google)" <j...@google.com> wrote:
> > Just an FYI, the ability to fetch just the keys for entities which match
> a
> > query (instead of fetching the full entity) is a feature request which is
> on
> > our radar.
> >
> > Good question,
> >
> > Jeff
> >
> > On Wed, Apr 15, 2009 at 7:57 AM, 风笑雪 <kea...@gmail.com> wrote:
> > > No you can't.
> > > The entity stores as a pair of (key: value). You can only get both of
> them
> > > at a same time.
> >
> > > I suggest you use a memcache:
> >
> > > index = memcache.get('index')
> > > if not index:
> > > index = []
> > > result = query.fetch(15) # maybe you need do it several times
> > > index.append([e.key() for e in result]) # maybe you need
> > > append several times
> > > memcache.set('index', index)
> >
> > > 2009/4/15 mbac...@googlemail.com <mbac...@googlemail.com>
> >
> > >> Hello everyone, I would like to ask if there is any way to fetch only
> > >> db.Key objects from a db.Query. I want to generate a list of links (a
> > >> Google sitemap) that point to the place there all the data is shown.
> > >> All the information to generate the link is part of the key name and
> > >> therefore fetching hundreds of db.Model instances is not needed.
> > >> Currently I can fetch around 15 instances, because of the datastore
> > >> timeout limits. I am already using sitemapindexe's to split my sitemap
> > >> into multiple HTTP requests, but I still need to fetch more than those
> > >> ~15 key names to display all links.
> >
> > >> Any ideas? Thanks in advance.
> >
> >
> >
>
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