Question

I am new in rails 3, and following the guide in ruby site I build the first blog application.

However in the app,the model “Comment” do not have edit/update/delete operation.

Then I tried to add it,but I fails.

Instead of just generate model for model “Comment”,I create the scaffold for model “Comment” using:

rails generate scaffold Comment commenter:string body:text post:references

And in the post.show page,I modify it like this:

<% @post.comments.each do |comment| %>
  <tr>
    <td><%= comment.commenter %></td>
    <td><%= comment.body %></td>
    <td><%= link_to 'Edit', edit_comment_path(comment) %></td>
    <td><%= link_to 'Destroy', comment, confirm: 'Are you sure?', method: :delete %></td>
  </tr>
<% end %>

They are listed,but when I click the ‘edit’ or ‘delete’ link,it will try to jump to:

http://localhost:3000/comments/1

And Then I will get the error:

No route matches [GET] "/comments/3/edit" or

No route matches [DELETE] "/comments/3"

I have no idea now.

Is there any demo out of box I can learn?

---

UPdate:

In the routes.rb:

resources :posts do
  resources :comments
end

Note:the following is confided manually by myself.

config generated by rails is :

resources :posts
resources :comments

Why I modify it is that in the comment build form,the post url should be “/posts/1/comments” for create new Comment,otherwise the post url will be “/comments” which will not associate the post and the comment.

Answer 1

Did you configure your routes? Your config/routes.rb should contain

resources :comments

you can also run rake routes to see what are the available url for your application based on your resource configuration.

Edit:

For a demo you can try this video on youtube. However, you can find lots of videos in web regarding this.

Edit:

So seems you need your comment resource in two ways. Both as a nested resource of posts and top level resource as well. So you can have two things together then

resources :posts do
   resources :comments
end
resources :comments