Emberjs controller receives return value of the Route's model() method?

I'm working on Ember 2.13.0

The Ember.js doco for controllers says "The controller receives a single property from the Route – model – which is the return value of the Route's model() method." .

I'm not clear how I can access this data.

I have a route that looks like this :

export default Ember.Route.extend({
    model: function() {
      return this.store.findAll('costcentrehierarchyfortree');
    }
});

And a controller that looks like this :

export default Ember.Controller.extend({
    data: function() {
            var arrJSTreeElements = this.model.map(obj =>{ 
                /*
                 * This is the type of structure that needs to be output
                 *
                [
                    { "id" : "ajson1", "parent" : "#", "text" : "Simple root node" },
                    { "id" : "ajson2", "parent" : "#", "text" : "Root node 2" },
                    { "id" : "ajson3", "parent" : "ajson2", "text" : "Child 1" },
                    { "id" : "ajson4", "parent" : "ajson2", "text" : "Child 2" },
                ]
                */
                var rObj = {};
                rObj['id'] = obj.cchcceidchild;
                if (obj.cchcceidparent === obj.cchcceidchild)
                {
                    //This is the top of the tree
                    rObj['parent'] = "#";
                }
                else
                {
                    rObj['parent'] = obj.cchcceidparent;
                }
                rObj['text'] = obj.ccidescriptionchild;
                return rObj;

            });
            return arrJSTreeElements ;
    }
});

But when I visit the route in question I get a console error

Cannot read property 'map' of undefined

So I guess that using this.model to access the data returned from the route's model() method is not the way to go ... so what am I doing wrong ?

Thanks in advance.