<?php
declare(strict_types=1);

namespace App\Entity;

use Doctrine\ORM\Mapping as ORM;

/**
 * @ORM\Embeddable()
 */
class Currency
{
    /**
     * @var string
     *
     * @ORM\Column(name="code", type="string", length=3)
     */
    protected $code;

    public function __construct(string $code)
    {
        $this->code = $code;
    }

    public function getCode(): string
    {
        return $this->code;
    }
}

<?php
declare(strict_types=1);

namespace App\Entity;

use Doctrine\ORM\Mapping as ORM;

/**
 * @ORM\Embeddable()
 */
class Money
{
    /**
     * @var string
     *
     * @ORM\Column(name="amount", type="string", length=255)
     */
    protected $amount;

    /**
     * @var Currency
     *
     * @ORM\Embedded(class="App\Entity\Currency")
     */
    protected $currency;

    public function __construct(string $amount, Currency $currency)
    {
        $this->amount = $amount;
        $this->currency = $currency;
    }

    public function getAmount(): string
    {
        return $this->amount;
    }

    public function setAmount(string $amount): void
    {
        $this->amount = $amount;
    }

    public function getCurrency(): Currency
    {
        return $this->currency;
    }
}

<?php

namespace App\Entity;

use Doctrine\ORM\Mapping as ORM;

/**
 * @ORM\Entity(repositoryClass="App\Repository\ProductRepository")
 */
class Product
{
    /**
     * @ORM\Id()
     * @ORM\GeneratedValue()
     * @ORM\Column(type="integer")
     */
    protected $id;

    /**
     * @var Money
     *
     * @ORM\Embedded(class="App\Entity\Money")
     */
    protected $price;

    public function getId(): ?int
    {
        return $this->id;
    }
}