Probably what you need is to just turn off "auto refresh" for that fill. Just override autoRefresh(List params) to return false.
Since LC DS does not know what each particular query is doing, it will refresh each query after performing an insert or update. It is looking to see if items have been added, removed or re-ordered based on the properties you change. In your case, maybe the query results are coming back in a completely different order so LC DS would be trying to update the order. It might also be that your equals/hashCode methods of your server side VOs are not defined properly so after it does the auto-refresh it thinks the items are completely different from the way they were originally. Turning on the server side debug logs for the Message.* and Service.* targets would give you a good idea of what is happening on the server. Jeff From: flexcoders@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of Steven Toth Sent: Wednesday, July 16, 2008 11:53 AM To: flexcoders@yahoogroups.com Subject: [flexcoders] Re: DataService gives CollectionEvents for each item when committing one item Anyone have any experience with Data Services? --- In flexcoders@yahoogroups.com<mailto:flexcoders%40yahoogroups.com>, "Steven Toth" <[EMAIL PROTECTED]> wrote: > > > I have a DataService that uses the Assembler interface approach (I > subclassed AbstractAssembler). When I update one item in the managed > Collection and commit it (autoCommit is false) I'm getting a > PropertyChangeEvent of kind UPDATE for each item in the Collection from > the DataService. In addition I get a CollectionEvent of kind REMOVE for > each item in the Collection, then a CollectionEvent of kind ADD for each > item in the Collection from the Collection itself. > > I'm assuming this is because the fill() is being called after the update > is completed. How do I commit/update the individual item so that I only > get an event (or set of events) for the item that was modified? Is that > possible when using a managed Collection or do I need to operate at the > individual item level. Am I doing something wrong (or not doing > something at all) in the Assembler? > > I'm very experienced with Remoting and Messaging but this is my first > time dealing with DataServices. Any help, samples,etc. are greatly > appreciated. Thanks. > > Here's the Assembler code... > > public class MyAssembler extends AbstractAssembler { > > > > private MyService svc = MyService.getInstance(); > > > > public Collection fill(List fillParameters) { > > if (fillParameters.size() >= 2) { > > > > int fillType = FlexDataHelper.getIntPrimitive( fillParameters.get (0) ); > > Long companyId = FlexDataHelper.getLong( fillParameters.get(1) ); > > > > switch(fillType) { > > case QueryType.ALL_WIDGETS_FOR_COMPANY: > > return svc.getAllWidgets(companyId); > > case QueryType.ACTIVE_WIDGETS_FOR_COMPANY_: > > return svc.getActiveWidgets(companyId); > > case QueryType.WIDGETS_BY_COMPANY_AND_CATEGORY: > > if (fillParameters.size() == 3) { > > Integer categoryId = FlexDataHelper.getInteger( fillParameters.get (2) ); > > return svc.getWidgets(companyId, categoryId); > > } > > } > > > > } > > // Throws a nice error > > return super.fill(fillParameters); > > } > > > > public Object getItem(Map uid) { > > return svc.getWidget( FlexDataHelper.getLong(uid.get("companyId")), > FlexDataHelper.getInteger(uid.get("widgetId")) ); > > } > > > > public void createItem(Object newVersion) { > > svc.saveWidget((WidgetValue)newVersion); > > } > > > > public void updateItem(Object newVersion, Object prevVersion, List > changes) { > > try { > > svc.saveWidget((WidgetValue)newVersion); > > } catch (Exception e) { > > Long companyId = ((WidgetValue)prevVersion).getCompanyId(); > > Integer widgetId = ((WidgetValue)prevVersion).getWidgetId(); > > System.err.println("*** Throwing DataSyncException when trying to save > widget = " + widgetId); > > throw new DataSyncException(svc.getWidget(companyId, widgetId), null); > > } > > } > > > > public void deleteItem(Object prevVersion) { > > try { > > svc.deleteWidget( (WidgetValue)prevVersion ); > > } catch (Exception e) { > > Long companyId = ((WidgetValue)prevVersion).getCompanyId(); > > Integer widgetId = ((WidgetValue)prevVersion).getWidgetId(); > > System.err.println("*** Throwing DataSyncException when trying to delete > widget = " + widgetId); > > throw new DataSyncException(svc.getWidget(companyId, widgetId), null); > > } > > } > > > > Here's the Flex UI code... > > public function getWidgetsForCompany( company:CompanyValue ):void { > > var widgets:ArrayCollection = new ArrayCollection(); > > var call:AsyncToken = widgetService.fill(widgets, > QueryType.ALL_WIDGETS_FOR_COMPANY, company.companyId); > > // Add a reference to the collection that will be filled for access by > the responder > > call.useLocalData = true; > > call.localData = widgets; > > call.addResponder( responder ); > > } > > public function saveWidget( widget:WidgetValue ):void { > > var call:AsyncToken; > > if (isNaN(widget.widgetId)) { > > call = widgetService.createItem(widget); > > } else { > > //Update > > call = widgetService.commit(new Array(widget), false); > > } > > call.addResponder( responder ); > > } >
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