Backbone from Scratch Chapter Project: Models

backbone_from_scratch_chapter_models.js

// BACKBONE MODELS PROJECT
console.log("Begin - BACKBONE MODELS PROJECT");

// Create a Backbone model for a Vehicle.
// A Vehicle is uniquely identified via one of its attributes called “registrationNumber”, which cannot be null or undefined.
// Vehicles can be retrieved from the server at “/api/vehicles”.
// A Vehicle should have a method called start(), which logs a message in the console: “Vehicle started.”
  var Vehicle = Backbone.Model.extend({
  idAttribute: "registrationNumber",
  urlRoot: "/api/vehicles",
  validate: function(attrs) {
    if (typeof attrs.registrationNumber === "undefined" || attrs.registrationNumber === null) {
      return "Registration Number may not be null or undefined";
    }
  },
  start: function() {
    console.log("Vehicle Started");
  }
});


// Derive a Backbone model from the Vehicle and call it Car.
// Override the start() method of the Vehicle inside the Car and log a message as: “Car with registration number {registrationNumber} started.”, where {registrationNumber} should be the value of the registrationNumber attribute.
var Car = Vehicle.extend({
  start: function() {
    console.log("Car with registration number " + this.attributes.registrationNumber + " started.")
  }
});

// Create an instance of the Car and initialise it with the following attributes:
  // • registrationNumber: XLI887
  // • color: Blue
var blueRide = new Car({
  registrationNumber: "XLI887",
  color: "Blue"
});

// Remove the registrationNumber attribute of the car object.
blueRide.unset("registrationNumber");

// Ask the car if it’s valid, and if not, log the validation error in the console.
if(!blueRide.isValid()) {
  console.log(blueRide.validationError);
}

// Set the registrationNumber to XLI887 again.
blueRide.set("registrationNumber", "XLI887");

// Ask the car if it’s valid and log the result in the console.
console.log(blueRide.isValid());