if ($entity_type == 'node' || $entity_type == 'user') {
  $title = t('Reverse @entity', array('@entity' => ucfirst($info['label'])));
  $help = t('Add information on the base @entity from the group membership.', array('@entity' => ucfirst($info['label'])));
  $data['og_membership']['reverse_' . $entity_type . '_rel'] = array(
    'group' => t('OG Membership'),
    'title' => $title,
    'help' => $help,
    'relationship' => array(
      // Pass the entity to the handler.
      'entity' => 'og_membership',
      'handler' => 'views_handler_relationship',
      'label' => t($info['label']),
      'base' => $entity_type == 'user' ? 'users' : $entity_type,
      'base field' => $info['entity keys']['id'],
      'relationship field' => 'etid',
    ),
  );
}