Question

I have a service which returns an Array of ObjectProxy objects. I would like to cast this to a custom object (a value object) and create an ArrayCollection. How can I do this?

Edited:

I am using Django and PyAMF for the backend. I had to write a custom SQL query and I am wrapping the resulting records in ObjectProxy and sending the whole result as an ArrayCollection.

Here is my client side code:

[ArrayElementType("SessionVO")]
[Bindable]
private var _list:ArrayCollection;

private function onSessionResultSuccess(event:ResultEvent):void
{
    _list = new ArrayCollection(event.result as Array));
}

When I debug, I notice that the elements of event.result are of type ObjectProxy but the _list variable is null. Is there another than to loop over event.result and copy them into _list as SessionVO objects?

Answer 1

If you use the [RemoteClass] tag on your value objects, Flex remoting (Blaze, LCDS) will convert them to your value object for you when sending/returning from a remote service call.

The syntax for RemoteClass is

[RemoteClass(alias="com.co.custom.remote.class")]  <--- point to the remote java/php class   def
Public Class FooBar
{
    public instance variable;
}

Your service can then return an array or hashtable of this class and Flex remoting will convert it for you.
There are cases where objects can become opaque, which you may need to create ObjectProxy code to do custom marshaling, but this is not common. The RemoteClass marshaling can handle very ccomplex object types, subtypes, embedded objects in objects, etc. As long as all of objects on the AS side are typed with RemoteClass, it works as expected.