Rails: nested resources issue

Question

those are my routes:

  resources :forums, :shallow=>true do
    resources :topics, :shallow=>true do
      resources :posts
    end
  end

within topics/show.html.erb I added a form to leave a post (Post is like a comment for a Topic)

<%= form_for [@topic, @post] do |f| %>
    <div class="field">
    <%= f.label "content" %><br />
    <%= f.text_area :content %>
  </div>
  <div class="actions">
    <%= f.submit %>
  </div>
<% end %>

the problem is that the field :topic_id within the model Post stays empty. shouldn't it get the topic's id automatically?

thanks

Automatically? No. Show the code that saves your form data to it's new model instances. — deefour
– deefour, Commented Dec 10, 2012 at 12:36

Hck · Accepted Answer · 2012-12-10 14:01:54Z

1

The topic_id is not inside params[:post] in create action of your PostsController. So you need to assign topic_id to post in action manually, like this:

...
@post = Post.new(params[:post])
@post.topic_id = params[:topic_id]
if @post.save
  flash.notice "Post created successfully"
else
  flash.error "Error saving post"
end
...

answered Dec 10, 2012 at 14:01

Hck

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1 Comment

John Naegle Over a year ago

post = Topic.find(params[:topic_id]).posts.build(params[:post]) might be more resilient. Putting the Topic.find in a before filter for that controller would also be a good idea.

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