Backbone.js collection options

Question

I have written a model/view/collection using Backbone.js. My collection uses the fetch method to load the models from a remote server. The url required for this collection needs

Answer 1

The way you have the url property declared, the value will be determined once when the browser initially loads the javascript file, and 'id' will be undefined.

The Backbone.Collection accepts options as the second argument in its constructor, so you can pass the id value as an option, and then set the url value within the initialize function of the collection.

Here's an example

var Messages = Backbone.Collection.extend({
  initialize: function(models, options) {
    this.url = 'http://url/messages/' + options.id;
  },
  model: Message,
});

var collection = new Messages([], { id: 2 });
collection.fetch();