*/ protected $fillable = [ 'order_number', 'billing_username', 'billing_password', ]; /** * Generate unique order number */ public static function generateOrderNumber($resource): int { $order_number = static::firstOrCreate([ 'billing_username' => $resource->billing_username ?? 'asdasd', 'billing_password' => $resource->billing_password ?? 'asdasd', ], ['order_number' => '01122017270']); $order_number->update([ 'order_number' => $order_number->order_number + 1, ]); return $order_number->order_number; } }