Challenge 1: An index View — Solution

<!-- app/views/posts/index.html.erb -->
<h1>All Posts</h1>

<ul>
  <% @posts.each do |post| %>
    <li>
      <%= post.title %>
      <% if post.published? %>
        <strong>(Published)</strong>
      <% end %>
    </li>
  <% end %>
</ul>

=begin
Notes:
- <% @posts.each do |post| %> uses the logic-only tag (no =) because a
  loop itself doesn't produce a value to output -- only the things inside
  it do.
- <%= post.title %> uses the output tag, since this is exactly what needs
  to appear on the page, escaped automatically per the chapter's coverage
  of automatic escaping.
- <% if post.published? %> is also logic-only -- it decides WHETHER the
  "(Published)" text appears, but the conditional check itself produces no
  visible output.
- Every <% %> block that opens (each do, if) needs a matching <% end %>,
  exactly like Ruby's own block/if syntax from Course 1 -- ERB doesn't
  invent new syntax here, it embeds real Ruby control flow directly.
=end