title: How to put specific options on top of dropdown list in rails
body: <p>I need to show some specific options in a dropdown list on top and should sort other options in alpha order. For example if the list is,</p>
  
  <pre><code>["CANADA", "PORTUGAL", "AUSTRALIA", "USA", "BRAZIL"]
  </code></pre>
  
  <p>I need to show the dropdown list as (usa and portugal as per requirements on top of the list and others in alpha order.)</p>
  
  <pre><code>["USA", "PORTUGAL", "AUSTRALIA", "BRAZIL", "CANADA"]
  </code></pre>