Backbone fetch with parameters

gistfile1.js

MessageList = Backbone.Collection.extend({

  initialize: function(models, options) {
    options = options || {};
    this.offset = options.offset || 0;
    this.limit  = options.limit || 30;
    this.sortBy = options.sortBy || 'by_desc';
  },

  url: function() {
    return '/messages?' + 
           'offset=' + encodeURIComponent(this.offset) + '&' +
           'limit=' + encodeURIComponent(this.limit) + '&' + 
           'sort_by=' + encodeURIComponent(this.sortBy);
  },

  parse: function(response) {
    // Parse models
    // Parse offset, limit, sort by, etc
  }
  
});