Can you show us an example?
On Aug 3, 9:01 am, dlypka <dly...@gmail.com> wrote:
> PolyModel enables true polymorphic behavior when querying objects
> whose classes are derived from other classes.
> So, in the retrieved instance, all fields of all classes at and above
> the target class are available to the retrieved instance.
>
> When PolyModel is not used as the base class, then the query only
> returns the attributes of the queried class.
> Attributes of inherited classes are uninitialized.
>
> So using PolyModel as the base class, the web2py DAL classes can carry
> along GAE-specific attributes in base classes,
> one of the most useful being the Reference attribute, which will link
> together related instances so that GAE will return them in a single
> query.
> Also, Reference gives automatic bidirectional links.
>
> On Aug 2, 1:17 pm, mdipierro <mdipie...@cs.depaul.edu> wrote:
>
> > What is PolyModel? How is different than what DAL already does when
> > running on GAE?
>
> > On Aug 2, 11:33 am, dlypka <dly...@gmail.com> wrote:
>
> > > I just got an experimental version of T3 to work with the PolyModel
> > > base class in GAE.
> > > That gives inherited Classes.
> > > So GAE is Quite Amazing.
>
> > > I almost have my own DALnr ('nr' = non relational) for web2py working
> > > with GAE now.
> > > It is using my 'Phantom' Field concept (special table fields in a
> > > db.define_table(...) which do native GAE operations but are not
> > > otherwise part of the list of columns for that web2py table)
>
> > > In particular I got PolyModel to work together with the Reference
> > > feature which links together the related entities so that GAE loads
> > > them ***ALL*** in a
> > > single datastore query.
>
> > > In theory, my DALnr will allow creating web2py models which will work
> > > on both SQL and GAE and will automatically use 'nr' GAE native
> > > features if on GAE.
>
> > > ToDo: I still have to generalize my DALnr code.
>
> > > My first application of this DALnr is to a high performance TreeView
> > > control which loads all branches of a given level in PARALLEL using
> > > async multi simultaneous Ajax callbacks.
>
> > > On Aug 2, 11:34 am, Pynthon <forumx...@gmail.com> wrote:
>
> > > > IMO GAE is too difficult :P.
>
> > > > On 2 aug, 07:02, Bottiger <bottig...@gmail.com> wrote:
>
> > > > > Google has sunk too much time and effort into adapting Django to
> > > > > recommend another framework. They also need to attract more users to
> > > > > GAE which Django has plenty of.
>
> > > > > On Aug 1, 3:12 pm, mdipierro <mdipie...@cs.depaul.edu> wrote:
>
> > > > > > Yes, if only they'd understand we support GAE better than Django
> > > > > > does.
> > > > > > Our DAL and our appadmin work on GAE, the Django ORM and Django
> > > > > > admin
> > > > > > do not as far as I know.
>
> > > > > > Massimo
>
> > > > > > On Aug 1, 3:10 pm, Pynthon <forumx...@gmail.com> wrote:
>
> > > > > > > Watch
> > > > > > > this:http://googleappengine.blogspot.com/2009/05/web2py-support-new-datast...
--~--~---------~--~----~------------~-------~--~----~
You received this message because you are subscribed to the Google Groups
"web2py-users" group.
To post to this group, send email to web2py@googlegroups.com
To unsubscribe from this group, send email to
web2py+unsubscr...@googlegroups.com
For more options, visit this group at
http://groups.google.com/group/web2py?hl=en
-~----------~----~----~----~------~----~------~--~---
