[Rails] Couldn't reload a module when it's changed. Tried :require_dependency, :watchable_dirs, :unloadable

I'm completely messed with module reloading in development mode. I have
to restart app server each time I edit lib/z/nginx.rb which is included
in app/models/user_case.rb

app/models/user_case.rb
require_dependency 'z/nginx'
class UserCase < ActiveRecord::Base
include Z::Nginx
unloadable

I added to environment.rb
config.watchable_dirs['lib'] = [:rb]
config.watchable_dirs['lib/z'] = [:rb]
ActiveSupport::Dependencies.explicitly_unloadable_constants +=
%w[Z::Nginx UserCase]

But that doesn't work for me. When I change a string value, which is
returned by the module method, I get in a view the old value until app
server restarted.

How can I get the new value without restaring app server?

Rails 3.2.3

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