Using `MapFrom` for Recursive and Custom Mapping

The MapFrom helper allows you to reuse existing mappings inside another mapping configuration. It's especially useful for nested objects and collections, and provides functionality similar to AutoMapper's context.Mapper.Map(...).

🧠 What does it do?

It gives you access to the Konverter instance within a ForMember call, so you can call:

konverter.Map<TSource, TDestination>(source)

inside a mapping delegate.

✅ How to use

Option 1: Using `using static`

To enable direct use of MapFrom without the Map. prefix:

using static KonverterMap.Map;

Konverter.Instance.CreateMap<Filial, FilialDTO>()
    .ForMember(dest => dest.Cidade,
        MapFrom<Filial, Cidade, CidadeDTO>(src => src.Cidade))
    .ForMember(dest => dest.Empresa,
        MapFrom<Filial, Empresa, EmpresaDTO>(src => src.Empresa));

Option 2: Without `using static`

Use the full prefix when not importing the helper statically:

Konverter.Instance.CreateMap<Filial, FilialDTO>()
    .ForMember(dest => dest.Cidade,
        Map.MapFrom<Filial, Cidade, CidadeDTO>(src => src.Cidade))
    .ForMember(dest => dest.Empresa,
        Map.MapFrom<Filial, Empresa, EmpresaDTO>(src => src.Empresa));

🔄 ReverseMap compatibility

If you call .ReverseMap() and you’ve already configured:

CreateMap<Cidade, CidadeDTO>().ReverseMap();
CreateMap<Empresa, EmpresaDTO>().ReverseMap();

The MapFrom references will work automatically in both directions.

🧪 Full working example

Konverter.Instance.CreateMap<Cidade, CidadeDTO>().ReverseMap();
Konverter.Instance.CreateMap<Empresa, EmpresaDTO>().ReverseMap();

Konverter.Instance.CreateMap<Filial, FilialDTO>()
    .ForMember(dest => dest.Cidade,
        Map.MapFrom<Filial, Cidade, CidadeDTO>(src => src.Cidade))
    .ForMember(dest => dest.Empresa,
        Map.MapFrom<Filial, Empresa, EmpresaDTO>(src => src.Empresa))
    .ReverseMap();

This enables recursive, clean, and safe mapping for nested objects.

Using MapFrom for Recursive and Custom Mapping