default value of form in Symfony

Question

To make a dafault value of select in my form I do like that :

   $def_volume = array(-1=>"Please select a volume");
   $def_issue = array(-1=>"Please select issue");

   $volumes = array_merge($def_volume,IssuePeer::getAllVolumesForListChoices());
   $issues = array_merge($def_issue,IssuePeer::getAllIssuesForListChoices());

   $this->setWidgets(array(
  'keyword'    => new sfWidgetFormInput(),
  'volume' => new sfWidgetFormSelect(array('choices' => $volumes)),
  'issue' => new sfWidgetFormSelect(array('choices' => $issues)),
));

   $this->setValidators(array(
  'keyword'    => new sfValidatorString(array('required' => true)),
  'volume' => new sfValidatorChoice(array('choices' => array_keys(IssuePeer::getAllVolumesForListChoices()))),
  'issue' => new sfValidatorChoice(array('choices' => array_keys(IssuePeer::getAllIssuesForListChoices()))),
));

the output :

<select id="filterSearch_volume" name="filterSearch[volume]">
<option value="0">Please select a volume</option>
....
</select>

but I hope to have the output like this :

<select id="filterSearch_volume" name="filterSearch[volume]">
<option value="">Please select a volume</option>
....
</select>

If you remark the value of the first value is value="0" but I hope that return me "null" like this value="".

Answer 1

Have you tried:

$def_volume = array('' => "Please select a volume");

That seems to work for me.