my changes

app/Http/Requests/DocumentRequest.php

@@ -0,0 +1,33 @@
+<?php
+namespace App\Http\Requests;
+
+use App\Http\Requests\Request;
+
+class DocumentRequest extends Request
+{
+
+    /**
+     * Determine if the user is authorized to make this request.
+     *
+     * @return bool
+     */
+    public function authorize()
+    {
+        return true;
+    }
+
+    /**
+     * Get the validation rules that apply to the request.
+     *
+     * @return array
+     */
+    public function rules()
+    {
+        return [
+            'type' => 'required|min:5',
+            // 'author' => 'required|min:4',
+            // 'stock' => 'required|integer',
+            // 'year' => 'required|integer|min:4'
+        ];
+    }
+}