增加ProductInfo Model

app/Models/ProductInfo.php

@@ -0,0 +1,16 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+
+class ProductInfo extends Model
+{
+    use HasFactory;
+
+    public function product()
+    {
+        return $this->belongsTo(Product::class);
+    }
+}