Question

I have a routing error, but I think my routes are correct:

Routing Error

No route matches {:controller=>"posts", :action=>"edit", :user_id=>#<Post id: 9, title: "Na Curva do Horizonte", content: "Eu na mesma minha opinião no pensamento vejo me ca...", created_at: "2013-01-12 20:41:57", updated_at: "2013-01-12 20:41:57", image_file_name: "iris_by_archang3lzz-d5k2i5l.jpg", image_content_type: "image/jpeg", image_file_size: 1101282, image_updated_at: "2013-01-12 20:41:56", user_id: 5>}
Try running rake routes for more information on available routes.

When I execute rake routes, the results are correct:

       user_posts GET    /user/:user_id/posts(.:format)              posts#index
                  POST   /user/:user_id/posts(.:format)              posts#create
    new_user_post GET    /user/:user_id/posts/new(.:format)          posts#new
   edit_user_post GET    /user/:user_id/posts/:id/edit(.:format)     posts#edit
        user_post GET    /user/:user_id/posts/:id(.:format)          posts#show

My routes are:

 resources :posts

  resources :user  do
    resources :posts,:comments
  end

  resources :posts do
    resources :comments
  end

and the link in error is:

<%= link_to 'Edit', edit_user_post_path(notice) %>

I don’t know what is wrong.

Answer 1

Since you want to edit a specific post which belongs to a specific user, you need to pass in those two as parameters to that link, putting the parent first. Otherwise rails doesn’t know which post you are about to edit.

<%= link_to 'Edit', edit_user_post_path(@user, @post) %>

So all you seem to need is those two variables.

Read you rake routes carefully. It says:

/user/:user_id/posts/:id/edit(.:format)

So there you can see that you need :user_id as well as :id, which refers to the post. Giving the objects as parameters will be enough, rails is smart enough to figure out their ids and use them for the link.