title: Rails flash with warning, alert and error not shown; only notice shown
body: <p>In my view, I have: </p>
  
  <pre><code>&lt;% flash.now[:error] = "ERROR FLASH" %&gt;
  &lt;% flash.now[:notice] = "NOTICE FLASH" %&gt;
  &lt;% flash.now[:warning] = "WARNING FLASH" %&gt;
  </code></pre>
  
  <p>When the page gets render, only the blue info box with NOTICE FLASH appears. The other two will not be shown. The same thing happens with the equal signs:</p>
  
  <pre><code>&lt;%= flash.now[:error] = "ERROR FLASH" %&gt;
  &lt;%= flash.now[:notice] = "NOTICE FLASH" %&gt;
  &lt;%= flash.now[:warning] = "WARNING FLASH" %&gt;
  </code></pre>
  
  <p>Is there a setting in my rails app that sets warning or error flashes to not appear?</p>