An error occurs when assigning the data obtained from the background to the template.
以下是出错的代码
Argument 1 passed to think\Model::getRelationData() must be an
instance of think\model\Relation, instance of app\admin\model\Admin
given, called in E:\html\JiZhang\thinkphp\library\think\Model.php on
line 622 and defined
