title: drop down select list in CakePHP
body: <p>I want to generate a drop down select list with the form helper of CakePHP,</p>
  
  <p>I'am trying to pass an array in the <code>$this-&gt;Form-&gt;input()</code> method which is obtained in the folowing
  way <code>$colors = $this-&gt;Color-&gt;find('all',...);$this-&gt;set('colors', $colors);</code>.</p>
  
  <p>thanks in advance.</p>
  
  <p><strong>UPDATE:</strong></p>
  
  <p>What I'm trying to do in CakePHP is this (in SQL code):</p>
  
  <pre><code>SELECT id, color 
  FROM colors Color WHERE id NOT IN (SELECT color_id FROM product_size_colors psc WHERE psc.product_id=16);
  </code></pre>
  
  <p>How can I replicate the above query in cakephp?</p>