Doctrine2: Best way to handle many-to-many with extra columns in reference table

Question

I\'m wondering what\'s the best, the cleanest and the most simply way to work with many-to-many relations in Doctrine2.

Let\'s assume that we\'ve got an album like

Answer 1

Here is the solution as described in the Doctrine2 Documentation

customer = $customer;
        $this->items = new ArrayCollection();
        $this->created = new \DateTime("now");
    }
}

/** @Entity */
class Product
{
    /** @Id @Column(type="integer") @GeneratedValue */
    private $id;

    /** @Column(type="string") */
    private $name;

    /** @Column(type="decimal") */
    private $currentPrice;

    public function getCurrentPrice()
    {
        return $this->currentPrice;
    }
}

/** @Entity */
class OrderItem
{
    /** @Id @ManyToOne(targetEntity="Order") */
    private $order;

    /** @Id @ManyToOne(targetEntity="Product") */
    private $product;

    /** @Column(type="integer") */
    private $amount = 1;

    /** @Column(type="decimal") */
    private $offeredPrice;

    public function __construct(Order $order, Product $product, $amount = 1)
    {
        $this->order = $order;
        $this->product = $product;
        $this->offeredPrice = $product->getCurrentPrice();
    }
}