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On Dec 22, 4:50 am, hawkett <[email protected]> wrote:
> Try using a dynamic tree control in your UI - e.g.
>
> http://www.smartclient.com/smartgwt/showcase/#tree_databinding_ondemand
>
> Load all your groups, and then whenever you expand a group node, make
> a separate query for the users of that group.
>
> On Dec 21, 7:35 am, ohadpr <[email protected]> wrote:
>
> > hi all,
>
> > i'm playing with appengine's data models and i've just hit a little
> > bump in the road:
>
> > my classes are Group and User, I have many groups and many users. a
> > user can
> > belong to a group, and so I've used a ReferenceProperty from the user
> > to the group
> > which gave me a set of users in the group for easy retrieval.
>
> > now I have a page that wants to show all the groups (lets say 50
> > groups) and for
> > each group the list of users in that group.
>
> > If i just get the rooms and for each room iterate over the set-of-
> > users, this generates
> > a new query per each group and is very slow.
>
> > what's the best way to handle this?
> > * should i store the relation in a new entity, then query for all the
> > groups, users and
> > relationships, build some python dictionaries and reconstruct the
> > whole thing in
> > python?
>
> > * should i denormalize the whole thing? how? i'd still want to group
> > the whole thing
> > by Group, should I do that with python dictionaries?
>
> > thanks a bunch,
> > ohad
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