Steps to debug delayed job in rails :

Open a rails console within your project

$ rails c

Loading development environment (Rails 3.2.13)

Initialise a delayed_job worker, and make it output to console by passing {quiet: false} to its initialiser.

1.9.2p325 :001 > worker = Delayed::Worker.new({quiet: false}) => #<Delayed::Worker:0x007fa295ecef48 @quiet=false>

Start the worker

1.9.2p325 :002 > worker.start