Added edit and cancel button

app/models/job.rb

@@ -62,6 +62,16 @@ class Job < ApplicationRecord
     errors.add(:pdf, 'must be a PDF')
   end
 
+  def able_to_cancel?
+    open?
+  end
+
+  # cancel job only if it is still open
+  def canceled!
+    self.status = :canceled if open?
+    save
+  end
+
   private
 
   def update_printed_at