Delayed Job giving a undefined method error

Delayed job (2.1.4) is working perfectly on my development machine, sending emails with gay abandon - however it is failing miserably when running on my server using Apache/Passenger(3.0.7). Rails 3.0.7 and ruby 1.9.2 on both btw.

I have seen that there is a problem when using thin where the job is created like this:

--- !ruby/struct:Delayed::PerformableMailer
object: !ruby/object:Class UserMailer

when it should read:

--- !ruby/struct:Delayed::PerformableMailer
object: !ruby/class UserMailer 

Mine are created correctly on my development machine, but the wrong way when created on the server.

Has anyone else had this problem, where should I start looking?

Stacktrace:

{undefined method `standard_message' for #<Class:0xc6ad054>
/home/safrea/site/shared/bundle/ruby/1.9.1/gems/delayed_job-2.1.4/lib/delayed/performable_mailer.rb:6:in `perform'\n
/home/safrea/site/shared/bundle/ruby/1.9.1/gems/delayed_job-2.1.4/lib/delayed/backend/base.rb:87:in `invoke_job'\n
/home/safrea/site/shared/bundle/ruby/1.9.1/gems/delayed_job-2.1.4/lib/delayed/worker.rb:120:in `block (2 levels) in run'\n
/usr/local/rvm/rubies/ruby-1.9.2-p180/lib/ruby/1.9.1/timeout.rb:57:in `timeout'\n
/home/safrea/site/shared/bundle/ruby/1.9.1/gems/delayed_job-2.1.4/lib/delayed/worker.rb:120:in `block in run'\n
/usr/local/rvm/rubies/ruby-1.9.2-p180/lib/ruby/1.9.1/benchmark.rb:309:in `realtime'\n
/home/safrea/site/shared/bundle/ruby/1.9.1/gems/delayed_job-2.1.4/lib/delayed/worker.rb:119:in `run'\n
/home/safrea/site/shared/bundle/ruby/1.9.1/gems/delayed_job-2.1.4/lib/delayed/worker.rb:177:in `reserve_and_run_one_job'\n
/home/safrea/site/shared/bundle/ruby/1.9.1/gems/delayed_job-2.1.4/lib/delayed/worker.rb:104:in `block in work_off'\n
/home/safrea/site/shared/bundle/ruby/1.9.1/gems/delayed_job-2.1.4/lib/delayed/worker.rb:103:in `times'\n
/home/safrea/site/shared/bundle/ruby/1.9.1/gems/delayed_job-2.1.4/lib/delayed/worker.rb:103:in `work_off'\n
/home/safrea/site/shared/bundle/ruby/1.9.1/gems/delayed_job-2.1.4/lib/delayed/worker.rb:78:in `block (2 levels) in start'\n
/usr/local/rvm/rubies/ruby-1.9.2-p180/lib/ruby/1.9.1/benchmark.rb:309:in `realtime'\n
/home/safrea/site/shared/bundle/ruby/1.9.1/gems/delayed_job-2.1.4/lib/delayed/worker.rb:77:in `block in start'\n
/home/safrea/site/shared/bundle/ruby/1.9.1/gems/delayed_job-2.1.4/lib/delayed/worker.rb:74:in `loop'\n
/home/safrea/site/shared/bundle/ruby/1.9.1/gems/delayed_job-2.1.4/lib/delayed/worker.rb:74:in `start'\n
/home/safrea/site/shared/bundle/ruby/1.9.1/gems/delayed_job-2.1.4/lib/delayed/command.rb:104:in `run'\n
/home/safrea/site/shared/bundle/ruby/1.9.1/gems/delayed_job-2.1.4/lib/delayed/command.rb:83:in `block in run_process'\n
/home/safrea/site/shared/bundle/ruby/1.9.1/gems/daemons-1.1.3/lib/daemons/application.rb:249:in `call'\n
/home/safrea/site/shared/bundle/ruby/1.9.1/gems/daemons-1.1.3/lib/daemons/application.rb:249:in `block in start_proc'\n
/home/safrea/site/shared/bundle/ruby/1.9.1/gems/daemons-1.1.3/lib/daemons/daemonize.rb:199:in `call'\n
/home/safrea/site/shared/bundle/ruby/1.9.1/gems/daemons-1.1.3/lib/daemons/daemonize.rb:199:in `call_as_daemon'\n
/home/safrea/site/shared/bundle/ruby/1.9.1/gems/daemons-1.1.3/lib/daemons/application.rb:253:in `start_proc'\n
/home/safrea/site/shared/bundle/ruby/1.9.1/gems/daemons-1.1.3/lib/daemons/application.rb:293:in `start'\n
/home/safrea/site/shared/bundle/ruby/1.9.1/gems/daemons-1.1.3/lib/daemons/controller.rb:70:in `run'\n
/home/safrea/site/shared/bundle/ruby/1.9.1/gems/daemons-1.1.3/lib/daemons.rb:195:in `block in run_proc'\n
/home/safrea/site/shared/bundle/ruby/1.9.1/gems/daemons-1.1.3/lib/daemons/cmdline.rb:109:in `call'\n
/home/safrea/site/shared/bundle/ruby/1.9.1/gems/daemons-1.1.3/lib/daemons/cmdline.rb:109:in `catch_exceptions'\n
/home/safrea/site/shared/bundle/ruby/1.9.1/gems/daemons-1.1.3/lib/daemons.rb:194:in `run_proc'\n
/home/safrea/site/shared/bundle/ruby/1.9.1/gems/delayed_job-2.1.4/lib/delayed/command.rb:81:in `run_process'\n
/home/safrea/site/shared/bundle/ruby/1.9.1/gems/delayed_job-2.1.4/lib/delayed/command.rb:75:in `block in daemonize'\n
/home/safrea/site/shared/bundle/ruby/1.9.1/gems/delayed_job-2.1.4/lib/delayed/command.rb:73:开发者_C百科in `times'\n
/home/safrea/site/shared/bundle/ruby/1.9.1/gems/delayed_job-2.1.4/lib/delayed/command.rb:73:in `daemonize'\n
script/delayed_job:5:in `<main>'

I have managed to fix this.

I created a setup_load_paths.rb a few weeks ago when bundler stopped working for some reason. This meant that the gemfile was being loaded everywhere, except by passenger. This messed up the call to YAML::ENGINE.yamler = "syck" which seems to be what mucked up the saving of the object.

I removed the setup_load_paths and everything is working nicely now.

If using the Syck parser doesn't seem to work (like mentioned in Marc's answer), try using the psych parser instead.

YAML::ENGINE.yamler = "psych"