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Mulitple Groups

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Level 1
Hi,

I'm writing an app that will have multiple groups. I want
each group to have properties, like groupType for example.

What's the best way to handle that? With a sharedModel, by
sending an object in a messageItem after node creation, or some
other way that's probably totally obvious?
0 Replies

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Level 1
sorry, I meant sharedCollection, not sharedModel.

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Level 10
Hi,

The question sounds interesting. We have an example in
examples folder called MultipleGroups which has a model called
MultipleGroupModel . The model has a collection that keeps track of
all users in a particular group.

For any new property specific to a group, I would publish it
as an Item on the groupName node ( see MultipleGroupModel file) and
in my model I will do a bookkeeping by having a property object for
that property indexed by groupName. Something like this,



I will have

_collectionNode.publish Item(new
MessageItem(groupName,propertyVal, propertyName));



In my model I will have an object lets say called
propertyNameObject["groupName"] = propertyVal



I will populate this object in itemReceive with something
like this,

if ( p_evt.item.itemID == propertyName ) {

propertyNameObject[p_evt.nodeName] = p_evt.item.body ;

}



In this way , you can have any new property associated with a
particular group.



Of course , prior to doing all this you need to have a shared
model like MultipleGroupModel and create the collectionNode and
groups(nodes) for that model. Refer to the example and the
MultipleGroupModel file for details.



Hope this helps.

Thanks

Hironmay Basu

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Level 1
Thanks for the reply.



I've been using the MultipleGroups example as a model for my
app.

I understand your suggestion. Thanks.



What are your thoughts on using a sharedCollection as a
solution with the groupName as the idField? I was thinking I would
also use one for users. Are there any guidelines for when to use
sharedCollections vs objects in messages?

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Level 10
Hi,



As you have seen, SharedCollection is just another shared
model specifically useful for Lists and DiataGrid as it exposes a
shared ListCollectionView. The Pro's of using it are having methods
for adding, removing , changing the dataCollection and cons are
having ListCollectionView overhead. Normally, if I am just using my
model for specfic purposes I would build it like the
MultipleGroupModel from scratch that extends EventDispatcher and
not use mx classes, but you can also use SharedCollection with
idField as groupName for your purpose I think.



Thanks

Hironmay Basu