cancan.rb

    user.role.permits.each do |k,v|
      controller_name = v[:controller].include?(":") ? (eval(v[:controller])) : (v[:controller].constantize)
      can v[:can].map(&:to_sym), controller_name # esto crea dinamicamente los permisos que necesito
    end

permit.rb

permits=>{
      "inspection_permit"=> {
        "controller" => "Inspection",
        "inspection_index" => "Yes",
        "inspection_show" =>  "Yes",
        "inspection_edit" =>  "No",
        "inspection_destroy" =>  "No",
        "inspection_create" =>  "Yes",
        "inspection_report" =>  "No",
        "inspection_components" =>  "No"
      },
      "employee_permit" =>{
        "controller" => "Employee",
        "settings"=> {
                      "employee_index" => "Yes",
                      "employee_show" =>  "Yes",
                      "employee_edit" =>  "Yes",
                      "employee_destroy" =>  "Yes",
                      "employee_create" =>  "Yes"
                      }
      }
    }