Heroku uninitialized constant Rails:Initializer (NameError) (noWWW Rack Middleware) - ruby-on-rails

Question

I'm running Cedar stack on Heroku, rails 3.1.3.
using:
http://trevorturk.com/2009/11/05/no-www-rack-middleware/
When I push to Heroku, I get:
app[web.1]: => Rails 3.1.3 application starting in production on http://0.0.0.0:15548
app[web.1]: => Call with -d to detach
app[web.1]: => Ctrl-C to shutdown server
app[web.1]: Exiting
app[web.1]: /app/config/environment.rb:7:in `<top (required)>': uninitialized constant Rails::Initializer (NameError)
Anyone have any ideas whats going on?
Here's my environment.rb (AppName = proper name for my app. i.e. thats not the issue)
# Load the rails application
require File.expand_path('../application', __FILE__)
# Initialize the rails application
AppName::Application.initialize!
Rails::Initializer.run do |config|
config.middleware.use "NoWWW" if RAILS_ENV == 'production'
end
lib/no_www.rb:
class NoWWW
STARTS_WITH_WWW = /^www\./i
def initialize(app)
#app = app
end
def call(env)
if env['HTTP_HOST'] =~ STARTS_WITH_WWW
[301, { 'Location' => Rack::Request.new(env).url.sub(/www\./i, '') }, ['Redirecting...']]
else
#app.call(env)
end
end
end

Answer 1

I had the same problem using Rails 3.1. I ended up using this post. It appears to be more involved than other solutions but there are really only two steps.
Make sure to change yoursite.com in the code. I overlooked this and had to rush another deployment after the fix.

Answer 2

The error you're receiving is telling you that you're referencing an old version of Rails. Rails 3.1 initializes quite a bit differently than it did 2 years ago when that article was written. In particular, the problem is with the now deprecated Rails::Initializer in this block:
Rails::Initializer.run do |config|
config.middleware.use "NoWWW" if RAILS_ENV == 'production'
end
You might have more luck with rack-rewrite. Regardless, check out the official Rails documentation for a good breakdown of current configuration and initialization.

Answer 3

It looks like your middleware file is not being loaded. Place your middleware class, no_www.rb in app/middleware. This way it will be auto-loaded by Rails. Then add your config statement to application.rb, near the end.
...
# Configure Rack middleware
config.middleware.use 'NoWWW'
end
end

Answer 4

I had this issue; I know it's a late answer but I wanted to add this for whoever needed it.
Make sure that your OmniauthCallbacksController IS IN A users FOLDER. "app/controllers/users/omniauth_callbacks_controller.rb"