How do I get the current absolute URL in Ruby on Rails?

For Rails 3.2 or Rails 4+

You should use request.original_url to get the current URL. Source code on current repo found here.

This method is documented at original_url method, but if you're curious, the implementation is:

def original_url
  base_url + original_fullpath
end

For Rails 3:

You can write "#{request.protocol}#{request.host_with_port}#{request.fullpath}", since request.url is now deprecated.

For Rails 2:

You can write request.url instead of request.request_uri. This combines the protocol (usually http://) with the host, and request_uri to give you the full address.

I think that the Ruby on Rails 3.0 method is now request.fullpath.

 url_for(params)

And you can easily add some new parameter:

url_for(params.merge(:tag => "lol"))

I think request.domain would work, but what if you're in a sub directory like blah.blah.com? Something like this could work:

<%= request.env["HTTP_HOST"] + page = "/" + request.path_parameters['controller'] + "/" + request.path_parameters['action'] %>

Change the parameters based on your path structure.

Hope that helps!

This works for Ruby on Rails 3.0 and should be supported by most versions of Ruby on Rails:

request.env['REQUEST_URI']

If by relative, you mean just without the domain, then look into request.domain.

For Rails 3.x and up:

#{request.protocol}#{request.host_with_port}#{request.fullpath}

For Rails 3.2 and up:

request.original_url

Because in rails 3.2 and up:

request.original_url = request.base_url + request.original_fullpath

For more info, plese visit http://api.rubyonrails.org/classes/ActionDispatch/Request.html#method-i-original_url