title: What could make checkboxes not show on the page?
body: <p>I am using Twitter Bootstrap for Rails, in a 3.2 app, and am not seeing the checkboxes appear.</p>
  
  <p>If I look at the same page in just straight HTML (with checkboxes hardcoded in, and using the regular Bootstrap assets) it works fine.</p>
  
  <p>The HTML code is produced correctly, I believe...e.g.:</p>
  
  <pre><code>&lt;div class="field"&gt;
      &lt;div class="control-group check_boxes optional"&gt;&lt;label class="check_boxes optional control-label"&gt;Listing Type&lt;/label&gt;&lt;div class="controls"&gt;&lt;label class="checkbox"&gt;&lt;input class="check_boxes optional" id="search_listing_type_id_1" name="search[listing_type_id][]" type="checkbox" value="1" /&gt;For Sale&lt;/label&gt;&lt;input name="search[listing_type_id][]" type="hidden" value="" /&gt;&lt;/div&gt;&lt;/div&gt;
    &lt;/div&gt;
  </code></pre>
  
  <p>Here is the Rails Code:</p>
  
  <pre><code>&lt;%= f.input :listing_type_id, collection: ListingType.order(:name), as: :check_boxes, label: "Listing Type" %&gt;
  </code></pre>
  
  <p>Here is a <a href="http://realty-cloud.herokuapp.com/listings/new" rel="nofollow">live example</a>. Right beside the text "List square footage", should be a checkbox. Scroll down to amenities, and there you will see a list that obviously should have checkboxes.</p>
  
  <p>This doesn't work in development either.</p>
  
  <p>Not quite sure why it's not showing up.</p>
  
  <p>Thoughts?</p>