Added sort function in admin/jobs index

app/models/job.rb

@@ -122,6 +122,14 @@ class Job < ApplicationRecord
     end
   end
 
+  def self.ransackable_attributes(auth_object = nil)
+    [ "created_at", "id", "costumer_firstname", "costumer_lastname", "pdf.", "number_of_plans_a0", "number_of_plans_a1", "number_of_plans_a2", "number_of_plans_a3", "costum_qm_plan", "cost", "status" ]
+  end
+
+  def self.ransackable_associations(auth_object = nil)
+    [ "pdf_blob" ]
+  end
+
   private
 
   def printed_pages_changes?