How to include full-path in Rails 3 link_to statement?

Question

I am trying to put a Rails link_to statement inside a Mailer email that includes the full-path (ie - http://localhost/contacts/id/confirm). The link_to statement that I am

Answer 1

First step:

#config/environments/production.rb
config.action_mailer.default_url_options = { :host => 'www.example.com' }

#config/environments/development.rb
config.action_mailer.default_url_options = { :host => 'localhost:3000' }

Second step:

<%= link_to "here", confirm_contacts_url(17) %>