/**
  * @param SS_HTTPRequest $request
  */
 public function run($request)
 {
     /** =========================================
          * @var Page $page
         ===========================================*/
     if (class_exists('Page')) {
         if (Page::has_extension('TwitterCardMeta')) {
             // Should we overwrite?
             $overwrite = $request->getVar('overwrite') ? true : false;
             echo sprintf('Overwrite is %s', $overwrite ? 'enabled' : 'disabled') . $this->eol . $this->eol;
             $pages = Page::get();
             foreach ($pages as $page) {
                 $id = $page->ID;
                 echo $this->hr;
                 echo 'Updating page: ' . $page->Title . $this->eol;
                 foreach ($this->fields_to_update as $fieldName) {
                     $oldData = DB::query("SELECT {$fieldName} FROM Page WHERE ID = {$id}")->column($fieldName);
                     $newData = DB::query("SELECT {$fieldName} FROM SiteTree WHERE ID = {$id}")->column($fieldName);
                     if (!empty($oldData)) {
                         // If new data has been saved and we don't want to overwrite, exit the loop
                         if (!empty($newData) && $overwrite === false) {
                             continue;
                         }
                         DB::query("UPDATE SiteTree SET {$fieldName} = '{$oldData[0]}' WHERE ID = {$id}");
                     } else {
                         echo 'Field "' . $fieldName . '" empty.' . $this->eol;
                     }
                 }
             }
         }
     }
 }