ArrayCollection error

Question

Hi All,
I am getting this error when i try to add an item to an arrayCollection:
Error: Find criteria must contain at least one sort field value.
at mx.collections::Sort/findItem()
at mx.collections::ListCollectionView/getItemIndex()
I have an advanced datagrid, base on a comboBox change I reload the data to the dataprovider so I have to remove all the items from the arraycollection and add the new data to be display in my ADG.
I was removing the items with removeAll, the error was showing at this line so change my code to using:
myArrayCollection = null;
myArrayCollection = new ArrayCollection();
After adding the new items to the array collection using a loop I have a sort:
----Loop----
tempObject = new Object();
myArrayCollection.addItem(tempObject);
myArrayCollection.refresh();
----End Loop----
var sort:Sort = new Sort();
my_adg.validateNow();
sort.fields = [new SortField("MY_FIELD",true)];
my_adg.dataProvider.sort = sort;
my_adg.dataProvider.refresh();
If I remove this sort, all work.
What is the issue here? The null is not removing the sort?
Also, in my ADG I have grouping collection.
<mx:GroupingCollection id="myGroupedData" source="{myArrayCollection}" >
Any ideas?
Thanks
Johnny

Answer 1

Hi,
Thanks for reply and help.
"MY_FIELD" is there, i just checked. I think I need to sort the ADG grouping in different way.
I am checking this link:
http://cookbooks.adobe.com/post_How_to_sort_items_within_group_in_AdvancedDataGrid-13047.h tml
I am not using action script to create my grouping.
I try this:
myGroupedData.grouping.fields.compareFunction = positionCompareFunction;
myGroupedData.refresh();
private function positionCompareFunction(a:Object, b:Object):int
                return ObjectUtil.stringCompare(a.MY_FIELD, b.MY_FIELD);
But it's not working. Any one can help with this?
Thanks
Johnny