Backbone fetch multiple

backbone-fetch-multiple.js

var Utils = {};

/**
 * Fetch multiple models(or collections) and execute passed callback
 *
 * @param {Array} stack - stack of objects
 * @param {Function} callback - exec on ready
 * @param {Object} ctx - callback context
 *
 * @returns {Object} context
 */

Utils.fetch = function(stack, callback, ctx){
  var counter = stack.length
    , error
    , cb;

  cb = function(){
    counter--;
    if(counter == 0){
      return callback.call(ctx);
    }
  }

  for(var i in stack){
    var task = stack[i];
    task.target.bind(task.event, cb).fetch();
  }

  return ctx;
}

var stack = [];
stack.push({ target: fooModel, event: 'reset' });
stack.push({ target: barModel, event: 'reset' });

Utils.fetch(stack, function(){
  console.log('Models are ready');
});