collection-crud/src/Entity/PurchasePrice.php

<?php declare(strict_types=1);

namespace App\Entity;

use Doctrine\ORM\Mapping as ORM;

trait PurchasePrice {
	#[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;
	}
}