Rails correct way to use link_to with devise - ruby-on-rails

Question

I'm getting started with rails and devise for authentication and I want to make a link to sign out when a user is logged into the admin page.
What is the correct way to write the link_to code
Here's my rake routes:
admin_index /admin/index(.:format) {:controller=>"admin/home", :action=>"index"}
new_user_session GET /users/sign_in(.:format) {:action=>"new", :controller=>"devise/sessions"}
user_session POST /users/sign_in(.:format) {:action=>"create", :controller=>"devise/sessions"}
destroy_user_session DELETE /users/sign_out(.:format) {:action=>"destroy", :controller=>"devise/sessions"}
user_password POST /users/password(.:format) {:action=>"create", :controller=>"devise/passwords"}
new_user_password GET /users/password/new(.:format) {:action=>"new", :controller=>"devise/passwords"}
edit_user_password GET /users/password/edit(.:format) {:action=>"edit", :controller=>"devise/passwords"}
PUT /users/password(.:format) {:action=>"update", :controller=>"devise/passwords"}
cancel_user_registration GET /users/cancel(.:format) {:action=>"cancel", :controller=>"devise/registrations"}
user_registration POST /users(.:format) {:action=>"create", :controller=>"devise/registrations"}
new_user_registration GET /users/sign_up(.:format) {:action=>"new", :controller=>"devise/registrations"}
edit_user_registration GET /users/edit(.:format) {:action=>"edit", :controller=>"devise/registrations"}
PUT /users(.:format) {:action=>"update", :controller=>"devise/registrations"}
DELETE /users(.:format) {:action=>"destroy", :controller=>"devise/registrations"}
home_index GET /home/index(.:format) {:controller=>"home", :action=>"index"}
root / {:controller=>"home", :action=>"index"}
I tried <%= link_to "Sign Out", destroy_user_session_path %> but when i click the link it gives me the error:
No route matches [GET] "/users/sign_out"

Answer 1

From this devise sample application, recommended on the Devise wiki:
<% if user_signed_in? %>
<li><%= link_to 'Edit account', edit_user_registration_path %></li>
<li><%= link_to 'Sign out', destroy_user_session_path, :method=>'delete' %></li>
<% end %>

Answer 2

the root error of your problem is that you haven't use RESTful routes in your "link_to".
you should correct your code to:
<%= link_to "Sign Out", destroy_user_session_path, :method => :delete %>
so that it will match the routes
DELETE /users(.:format) {:action=>"destroy", :controller=>"devise/registrations" }