优化更新

app/Exports/DepartmentExport.php

@@ -53,15 +53,21 @@ class DepartmentExport implements FromCollection, WithHeadings, WithMapping, Sho
      */
     public function map($department): array
     {
+        $parentName = '';
+        if ($department->parent_id) {
+            $parent = Department::find($department->parent_id);
+            $parentName = $parent ? $parent->name : '';
+        }
+
         return [
             $department->id,
             $department->name,
-            $department->parent_id ? Department::find($department->parent_id)?->name : '',
+            $parentName,
             $department->leader,
             $department->phone,
-            $department->sort,
+            (int)$department->sort,
             $department->status == 1 ? '启用' : '禁用',
-            $department->created_at ? $department->created_at->toDateTimeString() : '',
+            $department->created_at ? (string)$department->created_at : '',
         ];
     }
 }