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Passing Event payload to Command

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roelof

17 Sep, 2016 11:50 AM

Hi,

With reference to the following discussion: http://knowledge.robotlegs.org/discussions/robotlegs-2/15290-mapping-event-with-second-type-to-command-is-not-working

I am passing Event with Payload and mapping it to Command in the Context, but for some reason the payload does not arrive at my Command. I am injecting the Event into the Command:

[INJECT]
public var fileLoadedEvent:FileLoadedEvent;

override public function execute():void
{
var xmlFile:XML = fileLoadedEvent.file;
}

The event is fired from a service that loads a XML file from the host filesystem. When I put breakpoints in the service and/or event, the payload does show in the Variables windows (FlashBuilder Debug), but when it executes above assignment, then it bombs out, because payload is not present.

Please advise.

1. Support Staff 1 Posted by Ondina D.F. on 18 Sep, 2016 08:15 AM

   

   Hi roelof,

   [INJECT] should be [Inject]

   Take a look at the 2 most common problems pertaining to metadata:

   https://github.com/robotlegs/robotlegs-framework/wiki/Common-Proble...

   https://github.com/robotlegs/robotlegs-framework/wiki/Common-Proble...

   Look at how the eventCommandMap works and how to map your events to a command:

   https://github.com/robotlegs/robotlegs-framework/blob/master/src/ro...

   In robotlegs 2 you don't need to extend a command class. Any class having a public method execute() and mapped correctly to an event will be recognized by the framework as being a Command.

   I gave you an example of an Event class and a Command class in one of our previous discussions:
   http://knowledge.robotlegs.org/discussions/robotlegs-2/14800-displa...

   Hier a modified version with an injected event:

   public class SomeCommand
   {
       [Inject]
       public var someEvent:SomeEvent;
           
       public function execute():void
       {
       //hier you can access:
       // someEvent.somePayload
       }
   }
   

   If none of the above solves your problem, I'll need to see:

   • how are you mapping the event to the command
   • how is your event class looking, i.e. how are you defining the payload inside the event class ( your 'file' property)

   Have you tried to send another type of payload to the command, say, a simple String instead of an XML?
   Have you tried to access the loaded XML inside of your service class? Does it work there?

   Ondina

   • Edit

2. 2 Posted by roelof on 18 Sep, 2016 04:27 PM

   

   [Inject] seems to have solved the problem, apologies for wasting your time; it was a silly mistake that I shouldn't have missed.

   • Edit

3. Support Staff 3 Posted by Ondina D.F. on 19 Sep, 2016 10:41 AM

   

   Ah, don't worry :)
   This kind of mistakes are easy to overlook, especially because there are no warnings, no errors thrown at compile- or runtime to give us a hint about what's wrong.

   I wish you happy coding!

   • Edit

4. Ondina D.F. closed this discussion on 19 Sep, 2016 10:41 AM.