title: How to restrict a user from updating certain fields with CanCanCan?
body: <p>So if I have a User, and he can create/update his Service, but he cannot :publish(bool) them, what would be the best solution to skip this field from the update_params hash? </p>
  
  <p>I found <a href="https://stackoverflow.com/questions/5921591/cancan-limiting-a-users-ability-to-set-certain-model-attributes-based-on-their">this</a> similar question, but it links to CanCan 2.0 which never got released, and I was wondering if there is a way to solve this problem using CanCanCan, but could not find anything in their documentation. Many thanks!</p>