title: Can we have more than one field in g:select optionValue?
body: <p>Is there any way to show more than one field name in optionValue?</p>
  
  <pre><code>&lt;g:select name="id" from="${Books.list()}" optionKey="id"
            value="" optionValue="name"
            noSelection="${['null':'Select Publisher...']}"/&gt;
  </code></pre>
  
  <p>Expe:</p>
  
  <pre><code>&lt;g:select name="id" from="${Books.list()}" optionKey="id"
            value="" optionValue="name and author"
            noSelection="${['null':'Select Publisher...']}"/&gt;
  </code></pre>