gistfile1.js

module.Order = Backbone.Model.extend({

addProduct: function(product, options){
            options = options || {};
            var attr = JSON.parse(JSON.stringify(product));
            attr.pos = this.pos;
            attr.order = this;
            var line = new module.Orderline({}, {pos: this.pos, order: this, product: product});
            console.log("add products................",product)
            if(options.quantity !== undefined){
                line.set_quantity(options.quantity);
            }
            if(options.price !== undefined){
                line.set_unit_price(options.price);
            }
            if(options.discount !== undefined){
                line.set_discount(options.discount);
            }

            var last_orderline = this.getLastOrderline();
            if( last_orderline && last_orderline.can_be_merged_with(line) && options.merge !== false){
                last_orderline.merge(line);
            }else{
                this.get('orderLines').add(line);
            }
            this.selectLine(this.getLastOrderline());
        },

})

module.Order = module.Order.extend({
		
		addProduct: function(product, options){
			
			this._super(product, options);
			console.log("added product.................",product);
		}
		
	});