使用 AutoMapper 映射 N 到 N 个关系

Question

我正在用 c#、automapper 和 postgreSQL ef 核心做一个小例子。 我的实体是客户、产品、销售、销售产品。

我已经做了客户和产品的映射，但我不知道如何映射销​​售和产品之间的 n 到 n 关系。

这是我的代码：

销售实体：

public partial class Sales
{
    public Sales()
    {
        SalesProducts = new HashSet<SalesProducts>();
    }

    public int SaleId { get; set; }
    public int? ClientId { get; set; }
    public float TotalPrice { get; set; }
    public DateTime? Date { get; set; }

    public Clients Client { get; set; }
    public ICollection<SalesProducts> SalesProducts { get; set; }
}

产品实体：

public partial class Products
{
    public Products()
    {
        SalesProducts = new HashSet<SalesProducts>();
    }

    public int ProductId { get; set; }
    public string ProductName { get; set; }
    public string Description { get; set; }
    public float Price { get; set; }
    public int Quant { get; set; }

    public ICollection<SalesProducts> SalesProducts { get; set; }
}

SalesProducts 实体：

public partial class SalesProducts
{
    public int ProductId { get; set; }
    public int SaleId { get; set; }
    public int? Quantity { get; set; }

    public Products Product { get; set; }
    public Sales Sale { get; set; }
}

产品型号：

public class Products
{
    public int ProductId { get; set; }
    public string ProductName { get; set; }
    public string Description { get; set; }
    public float Price { get; set; }
    public int Quant { get; set; }
}

销售模式：

public class Sales
{
    public int SaleId { get; set; }
    public Clients Client { get; set; }
    public float TotalPrice { get; set; }
    public DateTime? Date { get; set; }

    public List<Products> Product { get; set; }
}

销售产品型号：

public class SalesProducts
{
    public int SaleId { get; set; }
    public int ProductId { get; set; }
    public int Quant { get; set; }
}

我尝试进行映射，但它总是给出关于未映射产品的错误：

public class SalesProfiles : Profile
{
    public SalesProfiles()
    {
        CreateMap<DataModels.SalesProducts, Models.SalesProducts>();

        CreateMap<DataModels.Sales, Models.SalesProducts>()
            .ForMember(dest => dest.SaleId, opt => opt.MapFrom(src => src.SaleId))
            .ReverseMap();

        CreateMap<DataModels.Products, Models.SalesProducts>()
            .ForMember(dest => dest.ProductId, opt => opt.MapFrom(src => src.ProductId))
            .ReverseMap();

        CreateMap<DataModels.Sales, Models.Sales>()
            .ForMember(dest => dest.SaleId, opt => opt.MapFrom(src => src.SaleId))
            .ForMember(dest => dest.Client, opt => opt.MapFrom(src => src.Client))
            .ForMember(dest => dest.Date, opt => opt.MapFrom(src => src.Date))
            .ForMember(dest => dest.TotalPrice, opt => opt.MapFrom(src => src.TotalPrice))
            .ForMember(dest => dest.Product, opt => opt.MapFrom(src => src.SalesProducts.Select(x => x.Product).ToList()));
    }
}

产品映射：

public class ProductsProfiles : Profile
{
    public ProductsProfiles()
    {
        CreateMap<Models.Products, BindingModels.Products>()
            .ForMember(dest => dest.ProductName, opt => opt.MapFrom(src => src.ProductName))
            .ForMember(dest => dest.Description, opt => opt.MapFrom(src => src.Description))
            .ForMember(dest => dest.Quant, opt => opt.MapFrom(src => src.Quant))
            .ForMember(dest => dest.Price, opt => opt.MapFrom(src => src.Price))
            .ReverseMap();

        CreateMap<Models.Products, DataModels.Products>()
            .ForMember(dest => dest.ProductId, opt => opt.MapFrom(src => src.ProductId))
            .ForMember(dest => dest.ProductName, opt => opt.MapFrom(src => src.ProductName))
            .ForMember(dest => dest.Description, opt => opt.MapFrom(src => src.Description))
            .ForMember(dest => dest.Quant, opt => opt.MapFrom(src => src.Quant))
            .ForMember(dest => dest.Price, opt => opt.MapFrom(src => src.Price))
            .ReverseMap();

        CreateMap<BindingModels.Products, DataModels.Products>()
            .ForMember(dest => dest.ProductName, opt => opt.MapFrom(src => src.ProductName))
            .ForMember(dest => dest.Description, opt => opt.MapFrom(src => src.Description))
            .ForMember(dest => dest.Quant, opt => opt.MapFrom(src => src.Quant))
            .ForMember(dest => dest.Price, opt => opt.MapFrom(src => src.Price))
            .ReverseMap();

        CreateMap<DataModels.Products, Models.Products>()
            .ForMember(dest => dest.ProductId, opt => opt.MapFrom(src => src.ProductId))
            .ForMember(dest => dest.ProductName, opt => opt.MapFrom(src => src.ProductName))
            .ForMember(dest => dest.Description, opt => opt.MapFrom(src => src.Description))
            .ForMember(dest => dest.Quant, opt => opt.MapFrom(src => src.Quant))
            .ForMember(dest => dest.Price, opt => opt.MapFrom(src => src.Price))
            .ReverseMap();
    }
}

客户映射：

public class ClientsProfiles : Profile
{
    public ClientsProfiles()
    {
        CreateMap<Models.Clients, BindingModels.Clients>()
            .ForMember(dest => dest.FirstName, opt => opt.MapFrom(src => src.FirstName))
            .ForMember(dest => dest.LastName, opt => opt.MapFrom(src => src.LastName))
            .ForMember(dest => dest.BirthDate, opt => opt.MapFrom(src => src.BirthDate))
            .ReverseMap();

        CreateMap<Models.Clients, DataModels.Clients>()
            .ForMember(dest => dest.ClientId, opt => opt.MapFrom(src => src.ClientId))
            .ForMember(dest => dest.FirstName, opt => opt.MapFrom(src => src.FirstName))
            .ForMember(dest => dest.LastName, opt => opt.MapFrom(src => src.LastName))
            .ForMember(dest => dest.BirthDate, opt => opt.MapFrom(src => src.BirthDate))
            .ReverseMap();

        CreateMap<BindingModels.Clients, DataModels.Clients>()
            .ForMember(dest => dest.FirstName, opt => opt.MapFrom(src => src.FirstName))
            .ForMember(dest => dest.LastName, opt => opt.MapFrom(src => src.LastName))
            .ForMember(dest => dest.BirthDate, opt => opt.MapFrom(src => src.BirthDate))
            .ReverseMap();

        CreateMap<DataModels.Clients, Models.Clients>()
            .ForMember(dest => dest.ClientId, opt => opt.MapFrom(src => src.ClientId))
            .ForMember(dest => dest.FirstName, opt => opt.MapFrom(src => src.FirstName))
            .ForMember(dest => dest.LastName, opt => opt.MapFrom(src => src.LastName))
            .ForMember(dest => dest.BirthDate, opt => opt.MapFrom(src => src.BirthDate))
            .ReverseMap();
    }
}

有人知道我该如何正确映射吗？

Answer 1

我试图制作一个映射，但它总是给出一个错误 未映射的产品：

您已经为如何映射两个SalesProducts 类定义了一个映射，但是它们具有不同的属性，因此您需要定义您希望如何映射这些属性。

CreateMap<DataModels.SalesProducts, Models.SalesProducts>();

具体来说，您的SalesProducts 之一具有另一个不具有的Product 和Sale 属性。您可以将其标记为忽略，否则您希望如何从没有这些属性的类中创建它？

您也没有从DataModels.Product 到Models.Product 的映射...这可能是您的错误。