laravel-admin 表格自定义行操作Call to undefined method

<?php
//可以用
$actions->disableDelete();  
$actions->disableEdit();   
$actions->disableView();

          $grid->setActionClass(Grid\Displayers\DropdownActions::class);
          $grid->actions(function ($actions) {
               $actions->add(new Publish());
          });