title: Conditional Select Statement in laravel eloquent
body: <p>I have a raw query like that</p>
  
  <pre><code>SELECT IF(`user_group` = '1', `total_score`, `score`) FROM `user`
  </code></pre>
  
  <p>Now how I can convert this query in <code>laravel</code> <code>eloquent</code> ORM</p>