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uploadAvatar: function (req, res) {

  req.file('avatar').upload({
    // don't allow the total upload size to exceed ~10MB
    maxBytes: 10000000
  },function whenDone(err, uploadedFiles) {
    if (err) {
      return res.negotiate(err);
    }

    // If no files were uploaded, respond with an error.
    if (uploadedFiles.length === 0){
      return res.badRequest('No file was uploaded');
    }


    // Save the "fd" and the url where the avatar for a user can be accessed
    User.update(req.session.me, {

      // Generate a unique URL where the avatar can be downloaded.
      avatarUrl: require('util').format('%s/user/avatar/%s', sails.getBaseUrl(), req.session.me),

      // Grab the first file and use it's `fd` (file descriptor)
      avatarFd: uploadedFiles[0].fd
    })
    .exec(function (err){
      if (err) return res.negotiate(err);
      return res.ok();
    });
  });
},