index.html.erb

<div>
  posts: <%= @posts.count %> <br>
  <% @posts.each do |post| %>
    <%= post.title %>
    <hr>
    <%= post.body %>
    <% if post.created_at < post.updated_at %>
      (edited)
    <% else %>
      (first version)
    <% end %>
    <hr>
    comments: <%= post.comments.count %> <br>
    <% post.comments.each do |comment| %>
      <%= comment.body %>
    <% end %>
    <hr>
  <% end %>
</div>