Path helpers in a loop

I have a Foo that :has_many Bars. GET Foo#index shows all of开发者_开发知识库 the Bars. View looks like this:

<% @foos.each do |foo| %>
    <% foo.bars.each do |bar| %>
        <%= link_to 'Download', download_bar_path %>
        <%= link_to 'New', new_bar_path( :foo => foo.id ) %>
    <% end %>
<% end %>

There is a def download in Bars controller and a route:

resources :bars do
    member do
        get 'download'
    end
end

rake routes shows

download_bar GET    /bars/:id/download(.:format)     {:action=>"download", :controller=>"bars"}

and URL /bars/1/download really works, but the first link in the view (download_bar_path) doesn't. It says No route matches {:action=>"download", :controller=>"bars"}.

What can be the problem?

<% @foos.each do |foo| %>
  <% foo.bars.each do |bar| %>
    <%= link_to 'Download', [:download, bar] %>
    <%= link_to 'New', [:new, :bar] %>
  <% end %>
<% end %>

You didn't specified the bar to download, you need to add it by changing this line

<%= link_to 'Download', download_bar_path(bar) %>