ML with total

gistfile1.txt

      var Clazz = Y.namespace("OCLC.W.Cart.ML.Lines").Base = Y.Base.create(
            "oclc-cart-ml-lines-base",
            Y.ModelList,
            [],
            {   
                model: Y.OCLC.W.Cart.M.Line.Base,

                initializer: function () {
                    Y.log("initializer", "debug", Clazz.NAME);
                    
                    this.after(
                        [
                            Y.OCLC.W.Cart.M.Line.Base.NAME + ":subtotalChange",
                            "add",
                            "reset",
                            "remove"
                        ],
                        function (e) {
                            Y.log("initializer - after model causing total change", "debug", Clazz.NAME);
                            this.calculateTotal();
                        },
                        this
                    );               
    
                    this.calculateTotal();
                },
            
                destructor: function () {
                    Y.log("destructor", "debug", Clazz.NAME);
                },

                calculateTotal: function () {
                    Y.log("calculateTotal", "debug", Clazz.NAME);

                    var total = 0;
                    this.each(
                        function (m) {
                            total += m.get("subtotal");
                        }
                    );

                    this.set("total", total);
                }
            },
            {   
                ATTRS: {
                    total: {
                        value: 0,
                        validator: Y.Lang.isNumber
                    }
                }
            }
        );