I Need Assistance with a Hierarchical Collection

[lowroller]

Hello,



I have three collections, A, B, and C. B is a collection
contained within A, and C is a collection contained in B.



When I add a new item to collection C, the item is
temporarily added to the collection correctly and then the
collection is quickly replaced with the last item added. I have
come to this conclusion after watching all items(mutiple items) of
collection C being displayed in a DataGrid correctly only to have
them replaced within a second with the last added item only.



I have modeled the application after the "Contact" sample
with Assemblers, DAOs, config files, etc. If anyone has any ideas
on how to correct this, I would appreciate it. I think it is
probably a setup issue within FDS XML files or something simple,
but I have tried multiple changes with no luck.



Thanks!

[aBill]

Hello



Need more information from it. What are the associations
among Collection A, B and C? How do you add item to collection C?





Thanks



William Chan

[lowroller]

Here are some code snippets. Please let me know if you need
additional information.



Another interesting thing I've seen is the code works
correctly if I wait several minutes between adding new players. It
seems to be some type of timing issue in FDS. Thanks!



Load the collections...



private function initComp():void {

parties = new ArrayCollection();

dsParties = new DataService("partyList");

dsParties.addEventListener(MessageEvent.RESULT,
resultHandler);

dsParties.fill(parties);

}



private function resultHandler(event:ResultEvent):void {

dgParties.selectedIndex = 0;

party = Party(parties.getItemAt(0));

tables = party.tables;



dgTables.selectedIndex = 0;

table = Table(tables.getItemAt(0));

players = table.players;

}







Add a new player...



private function addPlayer():void {

var tmpPlayer:Player = new Player();



tmpPlayer.playerId = 22;

tmpPlayer.playerName = "Johnny";

tmpPlayer.tableId = 1;

tmpPlayer.startingBalance = 100;

tmpPlayer.seatNum = 1;



players.addItem(tmpPlayer);

}

[aBill]

Not sure what your assembler code is. However, it looks like
you persist your player on the player assembler. What I mean you
don't need any player data send to the table assembler to update
table's player. There is a setting in association definition called
read-only. Try set it to true in your table assembler's players
association. By setting this, FDS can determine your creation
sequence



William Chan

[lowroller]

Are you referrig to the setup in the
data-management-config.xml file? Assuming it is, I have tried the
following and it did not work. Is this setup as you suggested? Once
again, thank you very much for your time!



<metadata>

<identity property="tableId"/>

<one-to-many property="players" destination="playerList"
read-only="true"/>

</metadata>

[aBill]

Hi,



Yes, it is what I mean. I think it should be configuration
issue, I tried something similar and it worked. Can you send me
your destination definitions to me wichan@adobe.com? I would like
to give it a try

Thanks



William

[lowroller · Accepted solution]

Instead of using read-only=true, I was able to use lazy=true
and solve the problem. Thanks again for your time. With your help,
I was able to gain a better understanding of how FDS handles these
collections

[aBill]

Hello,



I was over looked the problem. I found that your player
contain tableid. In object oriented FDS, it works with object not
its id

I just tried your scenario, it worked for me. Your player
should not contain tableid. I can email my application for you as a
sample



William Chan

[aBill]

hello



The followings are my class definitions

package

{

import flash.net.registerClassAlias;

import mx.collections.ArrayCollection;

import mx.data.IManaged;

import mx.data.utils.Managed;



[RemoteClass(alias="dataservice.associations.lvl3.Party")]

[Managed]

public class Party

{

public var id : uint;

public var name : String;

public var tables: ArrayCollection;

}

}



package

{

import flash.net.registerClassAlias;

import mx.collections.ArrayCollection;

import mx.data.IManaged;

import mx.data.utils.Managed;



[RemoteClass(alias="dataservice.associations.lvl3.Table")]

[Managed]

public class Table

{

public var id : uint;

public var name : String;

public var players: ArrayCollection;

}

}



package

{

import flash.net.registerClassAlias;

import mx.collections.ArrayCollection;

import mx.data.IManaged;

import mx.data.utils.Managed;



[RemoteClass(alias="dataservice.associations.lvl3.Player")]

[Managed]

public class Player

{

public var id : uint;

public var lastname : String;

public var firstname : String;



}

}

[aBill]

My function to add player

public function createAssociationsByObjectGraph():void

{

party = new Party()

party.name = "party1";

party.tables = new ArrayCollection();

party.tables.addItem(new Table());

party.tables.addItem(new Table());



party.tables.getItemAt(0).players = new ArrayCollection();

player = new Player();

player.firstname = "Apple";

player.lastname = "Red";

party.tables.getItemAt(0).players.addItem(player);

player = new Player();

player.firstname = "Bananna";

player.lastname = "Yellow";

party.tables.getItemAt(0).players.addItem(player);



party.tables.getItemAt(1).players = new ArrayCollection();

player = new Player();

player.firstname = "Orange";

player.lastname = "Orange";

party.tables.getItemAt(1).players.addItem(player);

player = new Player();

player.firstname = "George";

player.lastname = "Lucas";

party.tables.getItemAt(1).players.addItem(player);

ptDS.createItem(party);

ptDS.commit();

}



public function addPlayer():void

{

player = new Player();

player.firstname = "George";

player.lastname = "Lucas";


parties_dg.selectedItem.tables.getItemAt(1).players.addItem(player);

ptDS.commit();

}



]]>

</Script>

<Button click="createAssociationsByObjectGraph()"
label="CreatePartyTablesPlayers"/>

<Button click="addPlayer()" label="addPlayer"
enabled="{parties_dg.selectedItem != null}"/>