add the check_authorization callback of CanCanCan to the Grape API

Question

We are using grape api in our project. We used cancancan gem for authorization. Now we are thinking to add the check_authorization callback of CanCanCan to the Grape API. This ensures that each and every endpoint does a authorize! call (except if it’s explicitly skipped).

I added check_authorization in ApplicationController. But it seems does not make any impact.

class ApplicationController < ActionController::Base
  check_authorization
end

in my resource file

desc 'Get a specific job post'
  get ':id' do
    job_post = 
 JobPost.accessible_by(current_ability).find(params[:id)
  current_ability.authorize! :show, job_post
    
  present job_post, with: Entities::JobPost
 end

So far I understand, if any authorizaton is not declared in api file explicitly, check_authorzation method will triggers and raise cancan access denied. But I don't get any message if I don't authorize in job_post. suppose I comment this line

# current_ability.authorize! :show, job_post

and it should raise unauthorized, if check_authorization is triggered. But it seems application controller is not connected with grape apis.