url_for(options = {}, *parameters_for_method_reference) public

Returns the URL for the set of options provided. This takes the same options as url_for in action controller. For a list, see the documentation for ActionController::Base#url_for. Note that it’ll set :only_path => true so you’ll get the relative /controller/action instead of the fully qualified http://example.com/controller/action.

When called from a view, url_for returns an HTML escaped url. If you need an unescaped url, pass :escape => false in the options.

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March 20, 2009
9 thanks

Use the current URL, with changes

You can use the current URL, whatever it is, with changes, as in:

# Create a link to the current page in RSS form
url_for(:overwrite_params => {:format => :rss})

This can be super-helpful because it preserves any GET params (like search parameters)

March 3, 2011
8 thanks

Using namespaces

If you are using a namespace in your routes.rb, for example:

namespace :admin do
  resources :products

then you can:

url_for([:admin, @product])


url_for([:edit, :admin, @product])
August 24, 2012
0 thanks

Specify :host option in emails

Emails need a fully qualified URL (with domain). Use the :host parameter.

But note also that you need to specify a value that is not dependent upon the request context. http://api.rubyonrails.org/classes/ActionMailer/Base.html recommends setting a default host in application.rb For those of us who have development, test, staging and production environments, set in the environment-specific files, or in the :default hash in the mailer.

This applies to both +url_for(:host => “example.com”)+ and when using named routes as in +widgets_url(:host => “example.com”)+