Thanks all for your suggestions,I am trying different ways and reading
about various design patterns that can be used, I will update the thread
once i am done with some more work on this.

On Sun, May 3, 2009 at 11:17 PM, ryan
<ryanb+appeng...@google.com<ryanb%2bappeng...@google.com>
> wrote:

>
> also take a look at polymodel:
>
> http://code.google.com/appengine/docs/python/datastore/polymodelclass.html
>
> On May 1, 12:54 pm, adelevie <adele...@gmail.com> wrote:
> > try readinghttp://bret.appspot.com/entry/how-friendfeed-uses-mysql
> >
> > one pitfall to avoid is to rely on a recursive function to iterate
> > through a tree.
> >
> > On May 1, 9:24 am, Ted <suin...@googlemail.com> wrote:
> >
> > > > 1#
> >
> > > class Food(db.Model):
> > >     category = db.StringListProperty()
> > >     [other properties]
> >
> > > apple = Food(category=['fruit','red','iron','apple'])
> > > greenfruit = Food(category=['fruit','green'])
> > > veg3 = Food(category=
> > > ['vegetable','category1','category2','category3'])
> >
> > > If you query category='fruit', you'll get both apple and greenfruit.
> >
> > > > 2#
> >
> > > Try to use auto-completion provided by some Ajax libraries like YUI.
> >
> > > > 3#
> >
> > > Do you mean XMPP and Jaiku, seehttp://
> morethanseven.net/2009/02/21/example-using-xmpp-app-engine-imi...
> >
>

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