Backbone Collection

Backbone collections are simply an ordered set of models. Such that it can be used in situations such as;

• Model: Student, Collection: ClassStudents
• Model: Todo Item, Collection: Todo List
• Model: Animal, Collection: Zoo

Typically your collection will only use one type of model but models themselves are not limited to a type of collection;

• Model: Student, Collection: Gym Class
• Model: Student, Collection: Art Class
• Model: Student, Collection: English Class

Here is a generic Model/Collection example.

  var Song = Backbone.Model.extend({
      initialize: function(){
          console.log("Music is the answer");
      }
  });

  var Album = Backbone.Collection.extend({
    model: Song
  });

Building a collection

Now we are going to populate a collection with some useful data.

    var Song = Backbone.Model.extend({
        defaults: {
            name: "Not specified",
            artist: "Not specified"
        },
        initialize: function(){
            console.log("Music is the answer");
        }
    });

    var Album = Backbone.Collection.extend({
        model: Song
    });

    var song1 = new Song({ name: "How Bizarre", artist: "OMC" });
    var song2 = new Song({ name: "Sexual Healing", artist: "Marvin Gaye" });
    var song3 = new Song({ name: "Talk It Over In Bed", artist: "OMC" });

    var myAlbum = new Album([ song1, song2, song3]);
    console.log( myAlbum.models ); // [song1, song2, song3]