How do I configure a Rails 3.1 application to run under a specific directory

Question

Editorial Team

Asked: May 25, 20262026-05-25T10:33:47+00:00 2026-05-25T10:33:47+00:00

How do I configure a Rails 3.1 application to run under a specific directory such as “/r”?

I tried in config.ru:

map '/r' do
    run Debtor::Application
end

but that just returned “Not Found: /r”

To get it to work I had to enclose all routes in a scope:

scope '/r' do 
    #routes
end

and to add the following line to config/applcation.rb

config.assets.prefix = "/r/assets"

and to move my jquery ui css files from /stylesheets to /r/stylesheets.

this seems too complicated. isn’t there an easier way? and why isn’t my config.ru setting working?

my use case is to have a rails powered ajax backend for a wordpress server.

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Editorial Team · Answer 1 · 2026-05-25T10:33:47+00:00

Editorial Team

are you running under passenger?

Then RailsBaseURI is probably what you want.

If not running under passenger, please update your question to show what you are deployed under.

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