不允许删除部门时有子级部门

app/Http/Controllers/API/DepartmentController.php

@@ -61,6 +61,10 @@ class DepartmentController extends Controller
     {
         $department = Department::findOrFail($id);
 
+        if(!empty($department->children()->first())){
+            throw new \Exception("请删除子级部门");
+        }
+
         $department->delete();
 
         return $this->noContent();