In the wiki app, add a list of all the available wiki pages. The Dir class from Ruby core has an each method, Help=)

I'm ensuring a pages directory exists and then running the app, and I see what looks like a lone # sign. I assume these are the problems you're seeing also.

If I retrieve the page using the curl command (which may not be installed on your system), I get:

$ curl http://localhost:4567
<ul>
    #<Dir:0x00007f86c8a2c780>
</ul>

You'll also see something similar if you load the page in your browser and view the page source using the browser developer tools.

Here's what's happening:

• Your nav method isn't returning a string, it's returning a Dir object.
• That object is then converted to a string (<Dir:0x00007f86c8a2c780>) and rendered in your view.
• Because <Dir:0x00007f86c8a2c780> is in angle brackets, the browser treats it as an HTML tag, one it has no idea how to render.

Instead, you need to return a string from the nav method. But if you've taken our Ruby Basics course, you've seen that puts doesn't return a string, it returns nil.

Instead, you need to render the text you want within the view, welcome.erb.

<ul>
        <% @m.each do |file| %>
           <li><a href="/<%= file.sub(/.txt/, '') %>"><%= file.sub(/.txt/, '') %></a></li>
        <% end %>
</ul>

Note that this will output the . and .. entries as well; I'll leave it as an exercise for you to remove those. (Maybe you could have nav return an array instead of a Dir.)