Changing the base URL for Rails 3 development - ruby-on-rails

Question

I know I'm going to deploy to an environment with my application running with a base URL which looks like this:
http://someserver/mydepartment/myapp
My development environment is set up to use the default Rails configuration, which looks like this:
http://localhost:3000/myapp
I'd like to model this deployment path in my development environment. That is, I'd like to develop with a base URL which looks like this:
http://localhost:3000/mydepartment/myapp
That way, I can make all my URLs relative to "/" and they will work in both environments.
How can I change it so my application will live at this path in my development environment?
Solutions I've found, but don't work for me:
Setting the scope in routes.rb doesn't seem to work for the static content in public.
Using Apache's rewriting capabilities. I don't want to install Apache on my development box. Ideally the solution would work with WEbrick, though I seem to have Mongrel mostly working as well (there are some problems with Mongrel and Ruby 1.9.2).
Setting relative_url_root and similar suggestions which don't work with Rails 3.
Dynamically generating CSS/JavaScript and adjusting the paths to compensate between development and production environments.

Answer 1

You can try mapping your rails app rack config to a different base_uri.
All you need to do is wrap the existing 'run' command in a map block
try doing this in your rails 'config.ru' file:
map '/mydepartment' do
run Myapp::Application
end
Now when you 'rails server' the app should be at localhost:3000/mydepartment .
Not sure if this will give you the desired outcome, but worth a try.

Answer 2

Here’s how you can deploy a Rails 3.1 app to a subdirectory in Apache, replacing config.action_controller.relative_url_root which no longer exists.
In config/routes.rb:
scope 'my_subdir' do
# all resources and routes go here
end
In your Apache configuration file:
Alias /my_subdir /var/www/my_subdir/public
<Location /my_subdir>
SetEnv RAILS_RELATIVE_URL_ROOT "/my_subdir"
PassengerAppRoot /var/www/my_subdir
</Location>
And it should work, including automatically pointing all your assets to /my_subdir.