Adjust CronJob example to ignore failed jobs if they are not destroyed

Co-authored-by: z <[email protected]>

Author: Mat-Sedkowski

README.md

@@ -75,6 +75,7 @@ class CronJob < ApplicationJob
     def delayed_job
       Delayed::Job
         .where('handler LIKE ?', "%job_class: #{name}%")
+        .where(failed_at: nil) # ignore failed jobs if destroy_failed_jobs == false
         .first
     end