How to bring extra_data from join tables on rails3_jquery_autocomplete

I have a association User belongs_to Role and want to search users by name using rails3_jquery_autocomplete. And I want to show some values of Role after select a user.

Here is my controller

class UserController < ApplicationController
   autocomplete :user, :name, scopes: [:join_role], 
   extra_data: [:address, :email]   

And here are my models

class User < ActiveRecord::Base
  belongs_to :role
  attr_accessible :name, :address, :email
  scope :join_role, joins(:role)

class Role < ActiveRecord::Base
   attr_accessible :name, :level

How can I get the name and level values in the user autocomplete search?

I can't add :name, :level on the extra_data option neither :role because it will return a sql error.

Here rails3-jquery-autocomplete-search-by-several-fields says that I could override the get_autocomplete_items method but dont know how.

Something like that?

def get_autocomplete_items(parameters)
    result = []
    User.join_role.where('....').each do |user|
      result << {id:, label:, role:, 
        address: user.address, email:, level: user.role.level }

But it result in "undefined method `id' for Hash..."


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