Create DataSource from JavaScriptObject

[wgyouree]

Is there a way to instantiate a DataSource from a JavaScriptObject like the following but in SmartGWT...

isc.DataSource.create({
// json here
});

Since there is a constructor for DataSource which takes a JavaScriptObject, I thought all I had to do was pass the object to the constructor and it would build the DataSource with all the fields.

So I've subclassed RestDataSource and I'm passing a JSONObject to the constructor like so,

public MyDataSource(JSONObject data) {
	super(data.getJavaScriptObject());
}

and my the JSON object looks like this:

{
    ID:"com_test_Customer",
    Constructor:"RestDataSource",
    title: "Customer",
    pluralTitle: "Customers",
    serverType: "generic",
    fields:{
			middleName:{
				title: "Middle Name",
				length: 30,
				type: "text"
			},
			id:{
				title: "Id",
				primaryKey: true,
				required: true,
				type: "integer"
			}
    }
}

But when I try to use the DataSource it says it isn't created.

Is it possible to create DataSources this way in SmartGWT? If so, is there a document explaining the format that DataSource's expect the JavaScriptObject to comply with? or an example somewhere?

Thanks for your help,

- Greg

[sjivan]

Try the following :

public MyDataSource(JSONObject data) {
	super(data.getJavaScriptObject());
        getOrCreateJsObj();
}

An explicit register() method will be added to handle such cases in the future.

Sanjiv

[wgyouree]

I'm getting the following exception when I try that, it looks like the getOrCreateJsObj() method is throwing the exception.

Uncaught exception escaped : com.google.gwt.core.client.JavaScriptException
(TypeError): $wnd.isc[scClassName] is undefined

Am I specifying the right parameters in the JSON object? I thought Constructor:"RestDataSource" would be specifying the scClassName.

[pismenko]

Try the following :

static class MyDataSource extends RestDataSource {
		private static native JavaScriptObject createDataSourceFromConfig(JavaScriptObject config) /*-{
			return $wnd.isc.DataSource.create(config);
		}-*/;
		public MyDataSource(JavaScriptObject jsObjConfig) {
			super(createDataSourceFromConfig(jsObjConfig));
			this.getOrCreateJsObj();
		}
		public MyDataSource(JSONObject jsonConfig) {
			this(jsonConfig.getJavaScriptObject());
		}
	};