public function run()
 {
     $nodes = $this->getNodes();
     // Build the above list of nodes as a heirarchical tree
     // of categories.
     foreach ($nodes as $node_name => $node_data) {
         // Create each root node.
         $root_node = Menu::create(['name' => $node_name, 'url' => $node_data['url']]);
         // Create the children of the root node.
         if (!empty($node_data['children'])) {
             $this->createNodes($root_node, $node_data['children']);
         }
     }
 }