Rails 3 how to add a custom method to controller - ruby-on-rails-3

Question

I'm using the http://guides.rubyonrails.org/getting_started.html as an example to help me create my own application. I create the blog and comments modules just fine. When I add a method to the comments or blog controllers I cannot get a link_to action to work calling the new function. Everything points to a problem in the routes.rb but I've tried all the new syntax I've seen and nothing is working for me.
What I'm trying to do is create a simple execute method in the controller to run a ruby script and save the output to the database. Everything works according to the tutorial but when I try to extend the comment controller with a custom function called execute I cant get that to run.
comments_controller.rb #Same as destroy
def execute
#post = Post.find(params[:post_id])
#comment = #post.comments.find(params[:id])
#comment.destroy
redirect_to post_path(#post)
end
_comment.html.erb
<%= link_to 'Execute Comment', [comment.post, comment],
:method => :execute %>
routes.rb
resources :posts do
resources :comments do
get :execute, :on => :member
end
end
rake routes |grep execute
execute_post_comment GET /posts/:post_id/comments/:id/execute(.:format) {:action=>"execute", :controller=>"comments"}
Error when I click Execute comment link:
No route matches "/posts/3/comments/6"

Answer 1

run rake routes and see if there are any routes pointing to your controller action. If not you'll need to create one either as a "member action" or with a match rule.
If you do see the route, you can name it by passing an :as => route_name parameter to the routing rule. Doing so will enable the route_name_path() and route_name_url() helpers for your link_to
RailsCasts has a good quick rundown of the rails 3 routing syntax here
EDIT:
based on the code examples, try this :
<%= link_to 'Execute Comment', execute_post_comment_path(comment.post, comment) %>
According to the docs here the :method option can only contain valid http verbs (get, put, post, delete). The link_to helper can't puzzle out which action you want to hit with a custom member action, so you have to use the named route as above.
HTH