Looking at the error message, it seems to be saying that user_id is
nil ... which tells me that you don't have a user set for that photo
and it can't generate the URL without knowing the id of the user.

On Oct 28, 5:48 am, Vahagn Hayrapetyan <[EMAIL PROTECTED]
s.net> wrote:
> Hi, I have a question about routing and nested resources. I have an app
> with Photos that belong to Users via a many2one relationship. The URL:
>
> http://localhost:3000/photos
>
> lists all photos (from all users). Clicking on a random photo from this
> listing should send one to f ex:
>
> http://localhost:3000/users/2/photos/10
>
> Because I have this in my routes.rb:
>
>  map.resources :users, :member => { :enable => :put } do |users|
>     users.resources :photos, :name_prefix => 'user_',
>                              :controller => 'user_photos',
>                              :member => { :add_tag => :put, :remove_tag
> =>     :delete }
>  end
>
> However when I loadhttp://localhost:3000/photosI get this error
> message:
>
> user_photo_url failed to generate from {:controller=>"user_photos",
> :action=>"show", :user_id=>nil, :id=>#<Photo id: 2, user_id: nil, title:
> nil, body: nil, created_at: "2008-10-27 14:26:32", etc
>
> Extracted source (around line #2):
>
> 1: <li>
> 2:    <%= link_to image_tag(photo.public_filename('thumb')),
> user_photo_path(:user_id => photo.user, :id => photo) %>
> 3: </li>
>
> The above partial, _photo.rhtml, is what causes the error.
>
> This code has worked fine up until I refactored it to function with
> will_paginate instead of classic_pagination. I haven't touched the
> routing declarations or the _photo.rhtml partial.
>
> Any help will be appreciated!
>
> / Vahagn
> --
> Posted viahttp://www.ruby-forum.com/.
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