skeeks\cms\controllers\AdminTreeController::actionNewChildren PHP Method

    public function actionNewChildren()
    {
        /**
         * @var Tree $parent
         */
        $parent = $this->model;
        if (\Yii::$app->request->isPost) {
            $post = \Yii::$app->request->post();
            $childTree = new Tree();
            $parent = Tree::find()->where(['id' => $post["pid"]])->one();
            $childTree->load($post);
            if (!$childTree->priority) {
                $childTree->priority = Tree::PRIORITY_STEP;
                //Элемент с большим приоритетом
                if ($treeChildrens = $parent->getChildren()->orderBy(['priority' => SORT_DESC])->one()) {
                    $childTree->priority = $treeChildrens->priority + Tree::PRIORITY_STEP;
                }
            }
            $response = ['success' => false];
            Yii::$app->response->format = \yii\web\Response::FORMAT_JSON;
            try {
                if ($parent && $parent->processAddNode($childTree)) {
                    $response['success'] = true;
                }
            } catch (\Exception $e) {
                $response['success'] = false;
                $response['message'] = $e->getMessage();
            }
            if (!$post["no_redirect"]) {
                $this->redirect(Url::to(["new-children", "id" => $parent->primaryKey]));
            } else {
                return $response;
            }
        } else {
            $tree = new Tree();
            $search = new Search(Tree::className());
            $dataProvider = $search->search(\Yii::$app->request->queryParams);
            $searchModel = $search->getLoadedModel();
            $dataProvider->query->andWhere(['pid' => $parent->primaryKey]);
            $controller = \Yii::$app->cms->moduleCms->createControllerByID("admin-tree");
            return $this->render('new-children', ['model' => new Tree(), 'searchModel' => $searchModel, 'dataProvider' => $dataProvider, 'controller' => $controller]);
        }
    }