Use a Global ArrayCollection in Flash Builder Mobile application?

I am currently developing a mobile application using the latest version of Flash Builder and I need to create a Global ArrayCollection to store information in that is pulled from a local DB. I can pull back the data from the DB fine however I cannot seem to access the Global variable when I try. I have the follng .as file called "Model.as" which is located in a folder called valueObjects and that file contains the following code:

package valueObjects
{
    import flash.data.SQLConnection;

    import mx.collections.ArrayCollection;

    public class Model
    {
        public var ids:ArrayCollection = new ArrayCollection();

     开发者_运维问答   public function Model()
        {
        }
    }
}

Now I want to start populating this ArrayCollection with the info from the database so i import the class into the Default Package mxml doc which will be loaded up first when the app starts by using:

import valueObjects.Model;

Then in a private function I try to access the ids ArrayCollection and populate it however I get the following error:

-1120: Access of undefined property ids.
-Access of undefined property ids

Can anyone please help with this?? Thanks

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Have you created an instance of your Model class?

In the classes you want to access it, you should do something like this:

var myModel : Model = new Model();

To share the model instance between classes, you're going to have to do slightly more work. Either by passing around a reference to the same object, or using an alternate method such as creating a Singleton. Many Flex frameworks, such as Cairngorm or RobotLegs, use Singletons if you need an example.

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Or easiest way is make array static.

public static var ids:ArrayCollection = new ArrayCollection();

but for this case is Singleton way better.