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    <p>J03w is right. It looks like it has something to do with the @ variable you're passing to options in the select_tag.</p> <p>I couldn't figure it out but came up with an alternative that worked fine using a ruby each loop to create the select lists options.</p> <pre><code>&lt;ul&gt; &lt;li&gt; &lt;label&gt;Dropdown with search:&lt;/label&gt; &lt;select name="color-search" id="color-search" class="chzn-select"&gt; &lt;% @colorList.shuffle.each do |color| %&gt; &lt;option value="&lt;%= color %&gt;"&gt;&lt;%= color %&gt;&lt;/option&gt; &lt;% end %&gt; &lt;/select&gt; &lt;/li&gt; &lt;li&gt; &lt;label&gt;Dropdown menu:&lt;/label&gt; &lt;select name="colors" id="colors" class="uniform"&gt; &lt;% @colorList.shuffle.each do |color| %&gt; &lt;option value="&lt;%= color %&gt;"&gt;&lt;%= color %&gt;&lt;/option&gt; &lt;% end %&gt; &lt;/select&gt; &lt;/li&gt; &lt;/ul&gt; </code></pre> <p>I'm gonna keep playing around to see if I can figure out your initial issue but hopefully this helps you to move on to other things in the mean time.</p> <p>UPDATE 1: It looks like middleman doesn't like passing an array to the select_tag's options parameter which is odd because it should work fine. Initially I thought it was the data in the array that was being stored in @colorList but it all checks out.</p> <p>I even tried simplifying it to the example used in the <a href="http://middlemanapp.com/helpers/#toc_5" rel="nofollow">middleman docs</a> but still got the nil String error. I'm stumped.</p> <p>Perhaps an issue with the latest version of middleman (I'm using 3.1.4)?</p>
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