first upload all files

Modules/FlashSale/Entities/FlashSaleProduct.php

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+<?php
+
+namespace Modules\FlashSale\Entities;
+
+use Modules\Support\Money;
+use Modules\Order\Entities\Order;
+use Illuminate\Database\Eloquent\Relations\Pivot;
+
+class FlashSaleProduct extends Pivot
+{
+    /**
+     * Indicates if the IDs are auto-incrementing.
+     *
+     * @var bool
+     */
+    public $incrementing = true;
+
+    /**
+     * The table associated with the model.
+     *
+     * @var string
+     */
+    protected $table = 'flash_sale_products';
+
+    /**
+     * The attributes that should be mutated to dates.
+     *
+     * @var array
+     */
+    protected $dates = [
+        'end_date',
+    ];
+
+    /**
+     * The accessors to append to the model's array form.
+     *
+     * @var array
+     */
+    protected $appends = ['sold'];
+
+    public function getSoldAttribute()
+    {
+        return $this->orders()->sum('qty');
+    }
+
+    public function getPriceAttribute($price)
+    {
+        return Money::inDefaultCurrency($price);
+    }
+
+    public function orders()
+    {
+        return $this->belongsToMany(Order::class, 'flash_sale_product_orders', 'flash_sale_product_id')
+            ->withPivot('qty');
+    }
+}