Rails method works in console but not through browser -

here's in model:

:after_save after_save  def after_save     self.delay.do_thing end  def do_thing     dir.mkdir("#{rails.root}/my/path")     system("cd #{rails.root}/my/path && wget -with-some-flags") end 

this works flawlessly in development. however, in production, nothing happens. no errors, nothing.

i've checked several things like:

• sending command log before it's run make sure it's built correctly
• running command manually check it's working
• opening production rails shell , doing myobject.do_thing, works!
• switching between ticks , system() command, check if subshells
• adding absolute command paths, /usr/bin/wget instead, works in command line not in web browser.
• checked permissions of folder it's saving to

i know do_thing method running because creates folder in process of doing thing, appear in filesystem, not result of wget.

i'm genuinely stumped here. ideas?