Filter a view on the existence of an image for an imagefield field

No this won't work, I do not think filtering per-result row can be done through arguments:

<?php
if (!$field_user_picture) {
  $view->filter[0]['value'] = TRUE;
}
return $args;  // not that this will do anything!
?>

Begin the journey in #drupal-support

ben-agaric:
how can one filter a view based on the value (given or empty) of a CCK field -- CCK image in this case -- ?

Escalating directly to #drupal-views:

ben-agaric: I would like to filter a view conditional on the existence (value present or not) of a CCK image field.
ben-agaric: It looks like I will have to write a views filter hook? I don't see any way to do this with arguments.

[11:02am] • merlinofchaos has no idea what imagefield provides for args or filters.

[11:04am] ben-agaric: it provides an argument, with no operators, and does not provide a filter
[11:05am] ben-agaric: so to filter using it I will have to make it provide a filter, correct?

[11:07am] merlinofchaos: Most likely.
[11:09am] ben-agaric: onward.

[11:44am] ben-agaric: Well that was too easy, the filter was already added in the head code for imagefield. Which overall doesn't work but the filter does great. I think i have Dopry to thank. Thanks!

[11:48am] merlinofchaos: Oh nice

In most views you want to get rid of non-existent images, but for displaying on nodes you may want to replace with a default. This seems a little too complicated (to do less) but I think Rick Hood provides a good base here, http://drupal.org/node/166603

In your node-whatever.tpl.php add an else, and you can stick in any image you want:

<?php
$primaryimage = $node -> content['field_image_primary']['#value'];
$primaryimagexists = $node -> field_image_primary[0]['fid'];
if ($primaryimagexists != 0) {
print "<div class='primary-image'>" . $primaryimage . "</div>" ;
}
?>

Resolution

The fix was in the HEAD code, which must be built on the version 2 series of the imagefield module.

Agaric's modifications to the latest version 1 series, release candidate 1 version of the module (version = "5.x-1.2-rc1"), taken directly from HEAD at the time, begin where marked:

<?php
/**
 * Implementation of hook_field_settings().
 */
function imagefield_field_settings($op, $field) {
  switch ($op) {
    case 'form':
      $form = array();
      return $form;
    case 'validate':

      break;
    case 'save':
      return array();
    case 'database columns':
      $columns = array(
        'fid' => array('type' => 'int', 'not null' => TRUE, 'default' => '0'),
        'title' => array('type' => 'varchar', length => 255, 'not null' => TRUE, 'default' => "''", 'sortable' => TRUE),
        'alt' => array('type' => 'varchar', length => 255, 'not null' => TRUE, 'default' => "''", 'sortable' => TRUE),
      );
      return $columns;
// ben-agaric     added from head imagefield.module code
    case 'filters':
      return array(
        'not null' => array(
          'operator' => array('=' => t('Has Image')),
          'list' => 'views_handler_operator_yesno',
          'list-type' => 'select',
          'handler' => 'imagefield_views_handler_filter_is_not_null',
        ),
      );
  }
}

/**
 * Custom filter for imagefield NOT NULL
 */
function imagefield_views_handler_filter_is_not_null($op, $filter, $filterinfo, &$query) {
  if ($op == 'handler') {
    $query->ensure_table($filterinfo['table']);
    if ($filter['value']) {
      $qs = '%s.%s > 0';
    }
    else {
      $qs = '%s.%s = 0 OR %s.%s IS NULL';
    }
    $query->add_where($qs, $filterinfo['table'], $filterinfo['field'], $filterinfo['table'], $filterinfo['field']);
  }

}
// end ben-agaric added from head code
?>