src/Services/Ordering/Ordering.Domain/AggregatesModel/OrderAggregate/Order.cs

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using Microsoft.eShopOnContainers.Services.Ordering.Domain.Events;

namespace Microsoft.eShopOnContainers.Services.Ordering.Domain.AggregatesModel.OrderAggregate;

public class Order
    : Entity, IAggregateRoot
{
    // DDD Patterns comment
    // Using private fields, allowed since EF Core 1.1, is a much better encapsulation
    // aligned with DDD Aggregates and Domain Entities (Instead of properties and property collections)
    private DateTime _orderDate;

    // Address is a Value Object pattern example persisted as EF Core 2.0 owned entity
    public Address Address { get; private set; }

    public int? GetBuyerId => _buyerId;
    private int? _buyerId;

    public OrderStatus OrderStatus { get; private set; }
    private int _orderStatusId;

    private string _description;



    // Draft orders have this set to true. Currently we don't check anywhere the draft status of an Order, but we could do it if needed
    private bool _isDraft;

    // DDD Patterns comment
    // Using a private collection field, better for DDD Aggregate's encapsulation
    // so OrderItems cannot be added from "outside the AggregateRoot" directly to the collection,
    // but only through the method OrderAggrergateRoot.AddOrderItem() which includes behaviour.
    private readonly List<OrderItem> _orderItems;
    public IReadOnlyCollection<OrderItem> OrderItems => _orderItems;

    private int? _paymentMethodId;

    public static Order NewDraft()
    {
        var order = new Order();
        order._isDraft = true;
        return order;
    }

    protected Order()
    {
        _orderItems = new List<OrderItem>();
        _isDraft = false;
    }

    public Order(string userId, string userName, Address address, int cardTypeId, string cardNumber, string cardSecurityNumber,
            string cardHolderName, DateTime cardExpiration, int? buyerId = null, int? paymentMethodId = null) : this()
    {
        _buyerId = buyerId;
        _paymentMethodId = paymentMethodId;
        _orderStatusId = OrderStatus.Submitted.Id;
        _orderDate = DateTime.UtcNow;
        Address = address;

        // Add the OrderStarterDomainEvent to the domain events collection