littleshop/LittleShop/Models/OrderItem.cs

using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;

namespace LittleShop.Models;

public class OrderItem
{
    [Key]
    public Guid Id { get; set; }
    
    public Guid OrderId { get; set; }
    
    public Guid ProductId { get; set; }

    public Guid? ProductMultiBuyId { get; set; } // Nullable for backward compatibility

    public Guid? ProductVariantId { get; set; } // Optional: specific variant with potential price override

    [StringLength(500)]
    public string? SelectedVariants { get; set; } // JSON array of variants chosen (e.g., ["Red", "Blue", "Green"] for multi-buy)

    public int Quantity { get; set; }

    [Column(TypeName = "decimal(18,2)")]
    public decimal UnitPrice { get; set; }

    [Column(TypeName = "decimal(18,2)")]
    public decimal TotalPrice { get; set; }

    // Navigation properties
    public virtual Order Order { get; set; } = null!;
    public virtual Product Product { get; set; } = null!;
    public virtual ProductMultiBuy? ProductMultiBuy { get; set; }
    public virtual ProductVariant? ProductVariant { get; set; }
}