title: add superior statement in activerecord hash condition
body: <p>I have a hash which contains many conditions. I want to add to it another condition which uses the superior statement how can I do it?</p>
  <p>for example:</p>
  <pre class="lang-rb prettyprint-override"><code>// conditions is a hash of conditions
  conditions[:id]=&quot;&gt; 100&quot;
  personels=Personel.find(:all, :conditions=&gt;conditions)
  </code></pre>