add more controller

app/Http/Requests/SchoolIds/SchoolIdAssignRequest.php

@@ -0,0 +1,15 @@
+<?php
+
+namespace App\Http\Requests\SchoolIds;
+
+use App\Http\Requests\ApiFormRequest;
+
+class SchoolIdAssignRequest extends ApiFormRequest
+{
+    public function rules(): array
+    {
+        return [
+            'user_id' => ['required', 'integer', 'min:1', 'exists:users,id'],
+        ];
+    }
+}