使用 Automapper 映射嵌套集合

Question

I have been trying to map my entities to my viewmodels with AutoMapper. And faced problems with nested collection mapping.

The Source

public class Consignment
{
    public Guid Id { get; set; }
    public string Name { get; set; }
    public ICollection<ConsignmentLine> ConsignmentLines { get; set; }
    public ICollection<ConsignmentDocument> ConsignmentDocuments { get; set; }
}

public class ConsignmentLine
{
    public Guid Id { get; set; }
    public Guid ConsignmentId { get; set; }
    public ICollection<ConsignmentDocument> ConsignmentDocuments { get; set; }
}

public class ConsignmentDocument
{
    public Guid Id { get; set; }
    public Guid ConsignmentId { get; set; }
    public Guid ConsignmentLineId { get; set; }
    public string DocumentName { get; set; }
}

public class ConsignmentLineViewModel
{
    public Guid Id { get; set; }
    public Guid ConsignmentId { get; set; }
    public ICollection<ConsignmentDocumentViewModel> ConsignmentDocuments { get; set; }
}
 
public class ConsignmentDocumentViewModel
{
    public Guid Id { get; set; }
    public Guid ConsignmentId { get; set; }
    public Guid ConsignmentLineId { get; set; }
    public string DocumentName { get; set; }
}

The destination

public class ConsignmentDetailsViewModel
{
    public Guid Id { get; set; }
    public string Name { get; set; }
    public ICollection<ConsignmentLineViewModel> ConsignmentLines { get; set; }
    public ICollection<ConsignmentDocumentViewModel> ConsignmentDocuments { get; set; }
}

I can map consignmentDocuments for each consignment very easily but while mapping consignmentlines for each consignment i am getting an "AutoMapper Exception". I know the exception is being generated because of each consignmentLine has it's own collection of consignmentDocuments.

Right now my automapper profile

CreateMap<Consignment, ConsignmentDetailsViewModel>()
            .ForMember(vm => vm.consignmentLineViewModel, opt => opt.MapFrom(model => model.ConsignmentLine.ToList()))
            .ForMember(vm => vm.consignmentDocumentViews, opt => opt.MapFrom(model => model.ConsignmentDocument.ToList()));

How can I map all of them to the ConsignmentViewModel class?

Answer 1

Resolved the problem.

The solution is to create a map for ConsignmentLine to get the collection of ConsignmentDocuments.

CreateMap<Consignment, ConsignmentDetailsViewModel>()
        .ForMember(vm => vm.consignmentLineViewModel, opt => opt.MapFrom(model => model.ConsignmentLine))
        .ForMember(vm => vm.consignmentDocumentViews, opt => opt.MapFrom(model => model.ConsignmentDocument));

CreateMap<ConsignmentLine, ConsignmentLineViewModel>()
            .ForMember(vm => vm.consignmentDocumentViews, opt => opt.MapFrom(model => model.ConsignmentDocument));

Answer 2

If you act simply without thinking too complex in AutoMapper transactions, you can perform all your transactions.

Example:

 CreateMap<Consignment, ConsignmentDetailsViewModel>();
 CreateMap<ConsignmentLine, ConsignmentLineViewModel>();
 CreateMap<ConsignmentDocument, ConsignmentDocumentViewModel>();