views_redirect_relationship.module

<?php
/**
 * @file
 * Implements hooks and generates nid connectors.
 */

/**
 * Implements hook_view_api().
 */
function views_redirect_relationship_views_api() {
  return array(
    'api' => 3,
    'path' => drupal_get_path('module', 'views_redirect_relationship') . '/views',
  );
}

/**
 * Implements function hook_form_FORM_ID_alter().
 *
 * Adds a custom submit function to the redirect add/edit form.
 */
function views_redirect_relationship_form_redirect_edit_form_alter(&$form, &$form_state, $form_id) {
  array_unshift($form['#submit'], 'views_redirect_relationship_edit_form_submit');
}

/**
 * Custom submit function for the redirect add/edit form.
 *
 * Runs before the main submit function. Determines if the redirect
 * is to a node (node/###), and if so, it extracts the nid and sets
 * it to be saved to the database when the primary submit handler is run.
 */
function views_redirect_relationship_edit_form_submit(&$form, &$form_state) {
  $form_state['values']['nid'] = views_redirect_relationship_generate($form_state['values']['redirect']);
}

/**
 * Implements hook_menu().
 */
function views_redirect_relationship_menu() {
  $items['admin/config/search/redirect/views_redirect_relationship/generate'] = array(
    'title' => 'Re-generate Relationship NIDs (try if relationships are not working)',
    'page callback' => 'views_redirect_relationship_generate_all',
    'page arguments' => array(
      'admin/config/search/redirect',
    ),
    'access arguments' => array(
      'administer redirects',
    ),
    'type' => MENU_LOCAL_ACTION,
  );
  return $items;
}

/**
 * Callback function used to generate nid values.
 *
 * If {redirect}.redirect is a node reference,
 * convert it to simple nid and save it in {redirect}.nid
 *
 * @see views_redirect_relationship_menu()
 * @see views_redirect_relationship_enable()
 */
function views_redirect_relationship_generate_all($forward = FALSE) {
  try {
    $result = db_select('redirect', 'r')->fields('r')->condition('redirect', 'node/[0-9]+', 'REGEXP')->execute();

    foreach ($result as $record) {
      db_update('redirect')->fields(
        array(
          'nid' => views_redirect_relationship_generate($record->redirect),
        )
      )
      ->condition('rid', $record->{'rid'})
      ->execute();
    }
  }
  catch (Exception $e) {
    $errors = '';
    $errors .= $e;
  }

  (isset($errors) ? drupal_set_message($errors, 'error') : drupal_set_message(t('The redirect to node relationships were created successfully.'), 'status'));

  if ($forward) {
    drupal_goto($forward);
  }
}

/**
 * Helper function that returns the node id from the destination (node/###).
 */
function views_redirect_relationship_generate($destination) {
  if (preg_match('~(?P<nodetext>node/)(?P<nid>\d+)~', $destination, $matches)) {
    return $matches['nid'];
  }
  return 0;
}