Question

I’m current following the Rails Getting started guide, including creating a blog with post and comments models. In the post show method, there is a form to create a new comment. Like so.

<%= form_for([@post, @post.comments.build]) do |f| %>
  <div class="field">
    <%= f.label :commenter %><br />
    <%= f.text_field :commenter %>
  </div>
  <div class="field">
    <%= f.label :body %><br />
    <%= f.text_area :body %>
  </div>
  <div class="actions">
    <%= f.submit %>
  </div>
<% end %>

However, I want to prohibit users from posting more than one comment on a particular post. How would I go about doing this? I’ve been working with validators but I can’t seem to wrap my head around adding errors and displaying them on the posts#show page.

Answer 1

The issue was actually in my controller. Since submissions are a nested resource of posts, I need to re-set @post before calling render 'posts/show' in case of an error. This works, however you’ll notice that you’ll end up on a URL such as /posts/4/submissions/ with the appropriate webpage, rather than /posts/4