method

url_for

v4.2.9 - Show latest stable - 3 notes - Class: ActionView::Helpers::UrlHelper

url_for(options = nil) public

Basic implementation of url_for to allow use helpers without routes existence

# File actionview/lib/action_view/helpers/url_helper.rb, line 31
      def url_for(options = nil) # :nodoc:
        case options
        when String
          options
        when :back
          _back_url
        else
          raise ArgumentError, "arguments passed to url_for can't be handled. Please require " +
                               "routes or provide your own implementation"
        end
      end

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
end

then you can:

url_for([:admin, @product])

and:

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”)+

url_for

Related methods

Use the current URL, with changes

Using namespaces

Specify :host option in emails