Iron Router using waitOn function

router.js

Router.configure({
  layoutTemplate: 'layout',
  loadingTemplate: 'loading',
  waitOn: function() {
    return [
      Meteor.subscribe('posts'),
      Meteor.subscribe('comments')
    ];
  }
});

Router.map(function() {
  this.route('postsList', {path: '/'});

  this.route('postPage', {
    path: 'posts/:_id',
    data: function() {
      return Posts.findOne(this.params._id);
    }
  });

  this.route('postEdit', {
    path: '/posts/:_id/edit',
    data: function() {
      return Posts.findOne(this.params._id);
    }
  });

  this.route('postSubmit', { path: '/submit' });
});

var requireLogin = function(pause) {
  if (! Meteor.user()) {
    if (Meteor.loggingIn()) {
      this.render(this.loadingTemplate);
    } else {
      this.render('accessDenied');
    }

    pause();
  }
};


Router.onBeforeAction('loading');
Router.onBeforeAction(requireLogin, { only: 'postSubmit' });
Router.onBeforeAction(function() { clearErrors(); });