增加Coupon Model

app/Models/Coupon.php

@@ -0,0 +1,15 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+
+class Coupon extends BaseModel
+{
+    use HasFactory;
+
+    public function getDetailAttribute($value)
+	{
+		return $value ? json_decode($value, true) : [];
+	}
+}