общий код

app/Http/Requests/SubjectRequest.php

@@ -0,0 +1,19 @@
+<?php
+
+namespace App\Http\Requests;
+
+
+class SubjectRequest extends ApiFormRequest
+{
+    /**
+     * Get the validation rules that apply to the request.
+     *
+     * @return array
+     */
+    public function rules()
+    {
+        return [
+            'name' => 'required|unique:subjects',
+        ];
+    }
+}