限制保单上传格式只能是pdf

app/Admin/Controllers/OrdersManagement/InsuranceListController.php

@@ -76,7 +76,7 @@ class InsuranceListController extends AdminController
     protected function form()
     {
         $form = new Form(new Order());
-        $form->file('orderPack.insurance_img_url','保单文件')->help('请上传pdf文件')->rules('required');
+        $form->file('orderPack.insurance_img_url','保单文件')->help('请上传pdf文件')->rules('required|mimes:pdf');
         return $form;
     }
 }