app/assets/javascripts/users.js.coffee
//= require jquery.tokeninput
$ ->
$('#admin_user_roles_tokens').
tokenInput '/admin/roles.json',
queryParam: 'q[name_like]'
crossDomain: false
prePopulate: $('#admin_user_roles_tokens').data('pre')
searchingText: 'Buscando...'
hintText: 'Ingrese los roles que desea incluir'
noResultsText: "No existe este rol"