title: Select tag doesn't display on my form
body: <p>I'm writing a really simple form with 2 text fields and one select. For some reason, the select tag with options doesn't display on my page. I can see the 2 text fields and the label for the the select, but not the select it self.
  The app is written in rails and I use materialize.</p>
  
  <p>There might be something too obvious that I don't see it, but after 30mn of thinking, I guess it's fair to put it on SO :)
  Thanks</p>
  
  <p>Here's the code:</p>
  
  <pre><code>&lt;form action="/resources" method="post"&gt;
  
    &lt;input
    type="hidden"
    name="authenticity_token"
    value="&lt;%= form_authenticity_token %&gt;"&gt;
  
    &lt;label for="ressource_name"&gt;Ressource Name&lt;/label&gt;
    &lt;input type="text" id="ressource_name" name="resource[ress_name]" value="&lt;%= @resource.ress_name %&gt;"&gt;
  
    &lt;label for="ressource_link"&gt;Ressource Link&lt;/label&gt;
    &lt;input type="text" id="ressource_link" name="resource[link]" value="&lt;%= @resource.link %&gt;"&gt;
  
  
    &lt;label for="categories"&gt;Categories&lt;/label&gt;
    &lt;select id="categories" name="resource[category_id]"&gt;
      &lt;option value="1"&gt;Stuff 1&lt;/option&gt;
      &lt;option value="2"&gt;Stuff 2&lt;/option&gt;
      &lt;option value="3"&gt;Stuff 3&lt;/option&gt;
      &lt;option value="4"&gt;Stuff 4&lt;/option&gt;
      &lt;option value="5"&gt;Stuff 5&lt;/option&gt;
      &lt;option value="6"&gt;Stuff 6&lt;/option&gt;
      &lt;option value="7"&gt;Stuff 7&lt;/option&gt;
      &lt;option value="8"&gt;Stuff 8&lt;/option&gt;
    &lt;/select&gt;
    &lt;br&gt;
    &lt;input type="submit" value="Post"&gt;
  &lt;/form&gt;
  </code></pre>