minor fixes

app/Models/Core/CartStorage.php

@@ -0,0 +1,24 @@
+<?php
+
+namespace App\Models\Core;
+
+use Illuminate\Database\Eloquent\Model;
+
+class CartStorage extends Model
+{
+    protected $table = 'cart_storage';
+
+    protected $fillable = [
+        'id', 'cart_data',
+    ];
+
+    public function setCartDataAttribute($value)
+    {
+        $this->attributes['cart_data'] = serialize($value);
+    }
+
+    public function getCartDataAttribute($value)
+    {
+        return unserialize($value);
+    }
+}