title: adding checkbox array to kohana orm validate
body: <p>Having trouble adding checkbox values to db via orm</p>
  
  <p>Working for normal fields but not if more than one checkbox is selected on the checkbox questions that allow more than one option</p>
  
  <p>Here is the Form bit</p>
  
  <pre><code>&lt;?php echo Form::label('first_name', 'First Name')?&gt;&lt;br /&gt;
  &lt;?php echo Form::input('first_name', $profile-&gt;first_name, array('class'=&gt;'inputbox')); ?&gt;&lt;br /&gt;
  
  
  &lt;?php echo Form::label('last_name', 'Last Name')?&gt;&lt;br /&gt;
  &lt;?php echo Form::input('last_name', $profile-&gt;last_name, array('class'=&gt;'inputbox')); ?&gt;&lt;br /&gt;
  
  Favorite Genres: 
  &lt;label&gt;&lt;input type="checkbox" value="Horror"  name="genres[]"  /&gt;
  &lt;strong&gt;Horror&lt;/strong&gt;&lt;/label&gt;&lt;br /&gt;
  &lt;label&gt;&lt;input type="checkbox" value="Thriller"  name="genres[]"  /&gt;
  &lt;strong&gt;Thriller&lt;/strong&gt;&lt;/label&gt;&lt;br /&gt;
  </code></pre>
  
  <p>Here is the controller bit</p>
  
  <pre><code>if ($_POST) {
      if ($profile-&gt;values($_POST)-&gt;check()) {
          $profile-&gt;user_id = $user;
          $profile-&gt;save();
      }
  }
  </code></pre>
  
  <p>And Here is the Model bit</p>
  
  <pre><code>protected $_rules = array(
  
  'first_name' =&gt; array(
      'not_empty' =&gt; NULL,
  
  ),
  
  'last_name' =&gt; array(
      'not_empty' =&gt; NULL,
  
  ),
  
  
  );
  </code></pre>
  
  <p>Only not working when more than one checkbox is selected, I get this error </p>
  
  <blockquote>
    <p>Database_Exception [ 1241 ]: Operand should contain 1 column(s)</p>
  </blockquote>
  
  <p>Not sure best approach for this.. Should I serialize or implode ? Where to do this?</p>
  
  <p>I want to build basic search form in future to search 'like' values using this column.</p>