collection-crud/src/Entity/PurchasePriceTrait.php

<?php declare(strict_types=1);

namespace App\Entity;

use Doctrine\ORM\Mapping as ORM;

trait PurchasePriceTrait
{
    #[ORM\Column(name: 'purchase_price', type: 'money', nullable: TRUE)]
    private ?string $purchasePrice = NULL;

    public function setPurchasePrice(?string $purchasePrice): self
    {
        $this->purchasePrice = $purchasePrice;

        return $this;
    }

    public function getPurchasePrice(): string
    {
        if (empty($this->purchasePrice)) {
            return '0';
        }

        return $this->purchasePrice;
    }
}