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Error:Injector is missing a rule to handle injection into target

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kristoferjoseph

07 Feb, 2010 09:24 AM

I saw that there was a thread about this previously, but I am pretty sure there is a bug in v1.03 with injector.mapSingleton( foo )
In previous releases I was able to map a singleton without issue, but now I am getting the missing rule error.

in the Context startup method I have this:

injector.mapSingleton(TestModel);

TestModel is this:

public class TestModel extends Actor
{
    /**
    * @constructor
    */
    public function TestModel()
    {
        trace("TestModel::TestModel()");
        super();
    }

}

Trying to use it like this:

public class ApplicationMediator extends Mediator
{
    [Inject] public var model:TestModel;

    override public function onRegister():void
    {
        trace("ApplicationMediator::onRegister()"); 
    }
}

Throws an error every time.

1. 1 Posted by kristoferjoseph on 07 Feb, 2010 09:29 AM

   

   I figured it out.
   It was an order of operation issue.
   It seems you need to map the singleton before your mediator mappings.
   Otherwise there is a race condition where the mediator is created before the model is instantiated.
   The error message is just misleading.

   • Edit

2. Support Staff 2 Posted by Till Schneidere... on 07 Feb, 2010 11:57 AM

   

   I guess you're probably mediating the contextView in addition to other
   views, right? If so, that's what is causing what you're seeing:
   The MediatorMap has a special case for handling the contextView
   (http://github.com/tschneidereit/robotlegs/blob/master/src/org/robotlegs/base/MediatorMap.as#L117),
   which causes the mediator for that to be created immediately during
   the call to MediatorMap#mapView.
   In that case, the injector tries to inject into the contextView's
   mediator and fails if you're only creating the injection rules
   afterwards.

   • Edit

3. 3 Posted by kristoferjoseph on 07 Feb, 2010 11:22 PM

   

   Exactly. I must have missed the update that added the mapping of
   context.

   Kristofer

   • Edit

4. Till Schneidereit closed this discussion on 08 Feb, 2010 03:56 PM.