Handling model validation errors in Alloy

index.js

$.index.open();

// create an instance of the model
var model = Alloy.createModel('myModel');

// listen for the "error" event
model.on('error', function(model, error) {
    Ti.API.info('error handled: ' + error);
})

// attempt to set the doomed model
model.set({title:'hi there'});

// title should be undefined
Ti.API.info('title: ' + model.get('title'));

index.xml

<Alloy>
    <Window/>
</Alloy>

myModel.js

exports.definition = {
    config: {
		columns: {
		    "title": "TEXT"
		},
		adapter: {
			type: "sql",
			collection_name: "myModel"
		}
	},		
	extendModel: function(Model) {		
		_.extend(Model.prototype, {
			validate: function(attrs, opts) {
                // let's us know the validation executed
				Ti.API.info('validate executed');
                
                // always fail validation for the purposes of this test,
                // normally you would only return a value if your 
                // specific validation failed. Successful validation
                // return nothing.
				return "this always fails"; 
			}
		});
		
		return Model;
	}
}