How do I create a link that passes an ID for a custom action in Rails?0 <%= link_to "PDF", :action => "showpdf", :id => "#{@letter.id}.pdf" %>

I have the following code:

 <%= link_to "PDF", :action => "showpdf", :id => "#{@letter.id}.pdf" %>

'showpdf' is an action in my Letters controller.

My expectation is that this link should yield the following:

 http://domain.c开发者_高级运维om/letters/showpdf/id.pdf

But instead, I get:

 http://domain.com/letters/showpdf?id.pdf

If the default routes are :controller/:action/:id shouldn't this work?

Do I need to do something in the routes, even though the format for default appear right? Thanks!

Have you tried something like:

<%= link_to "PDF", :action => "show", :id => letter.id, :format => :pdf %>

where your route would be

:controller/:action/:id.:format

and in your controllers "show" action:

respond_to do |format|
  format.pdf  .....
  format.html .....
end