SubdomainFu: Tame sub domains in your Rails apps

SubdomainFu is a plugin developed by Michael Bleigh of Intridea that allows you to easily deal with subdomains in your Rails applications.

Not just a superficial hack, SubdomainFu even extends the Rails routing system to allow you to specify subdomains within routes. Example:

url_for(:controller => "my_controller",
  :action => "my_action",
  :subdomain => "awesome") # => http://awesome.intridea.com/my_controller/my_action

users_url(:subdomain => false)  # => http://intridea.com/users

# The full URL will be generated if the subdomain is not the same as the
# current subdomain, regardless of whether _path or _url is used.
users_path(:subdomain => "fun") # => http://fun.intridea.com/users
users_path(:subdomain => false) # => /users

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