No factory for Optional<Guid?> -> Guid

Hi

I am trying to map HotChocolate input types to entities and get this error, and could not find anything in the wiki on how to do this.

Here are example classes for DTO and Entity

public partial class CreateProjectDto
{
    public Optional<Guid?> Id { get; set; }
    public string Name { get; set; }
}

public class Project 
{
    public Guid Id { get; set; }
    public string Name { get; set; };
}

Running the following code generates an exception

var project = await dbContext.MapAsync<Project>(dto);

Exception

Detached.Mappers.Exceptions.MapperException: No factory for Optional<Guid?> -> Guid
   at Detached.Mappers.Mapper.<>c__DisplayClass9_0.<GetTypeMapper>b__0(TypePairKey key)
   at System.Collections.Concurrent.ConcurrentDictionary`2.GetOrAdd(TKey key, Func`2 valueFactory)
   at Detached.Mappers.Mapper.GetTypeMapper(TypePair typePair)
   at Detached.Mappers.TypeMappers.ExpressionBuilder.BuildGetKeyExpressions(TypePair typePair, LambdaExpression& getSourceKeyExpr, LambdaExpression& getTargetKeyExpr, Type& keyType)
   at Detached.Mappers.TypeMappers.Entity.Complex.EntityTypeMapperFactory.Create(Mapper mapper, TypePair typePair)
   at Detached.Mappers.Mapper.<>c__DisplayClass9_0.<GetTypeMapper>b__0(TypePairKey key)
   at System.Collections.Concurrent.ConcurrentDictionary`2.GetOrAdd(TKey key, Func`2 valueFactory)
   at Detached.Mappers.Mapper.GetTypeMapper(TypePair typePair)
   at Detached.Mappers.Mapper.Map(Object source, Type sourceClrType, Object target, Type targetClrType, IMapContext context)
   at Detached.Mappers.EntityFramework.EFMapper.Map[TEntity](DbContext dbContext, Object entityOrDTO, MapParameters parameters)
   at Detached.Mappers.EntityFramework.EFMapper.<>c__DisplayClass8_0`1.<MapAsync>b__0()
   at System.Threading.Tasks.Task`1.InnerInvoke()
   at System.Threading.Tasks.Task.<>c.<.cctor>b__272_0(Object obj)
   at System.Threading.ExecutionContext.RunFromThreadPoolDispatchLoop(Thread threadPoolThread, ExecutionContext executionContext, ContextCallback callback, Object state)
--- End of stack trace from previous location ---
   at System.Threading.ExecutionContext.RunFromThreadPoolDispatchLoop(Thread threadPoolThread, ExecutionContext executionContext, ContextCallback callback, Object state)
   at System.Threading.Tasks.Task.ExecuteWithThreadLocal(Task& currentTaskSlot, Thread threadPoolThread)
--- End of stack trace from previous location ---
   at Gateway.API.Mutations.ProjectMutations.CreateProjects(GatewayDbContext gatewayDbContext, CreateProjectDto[] dtos, CancellationToken cancellationToken) in C:\dev\Connected\src\Gateway\Gateway.API\Mutations\ProjectMutations.cs:line 21

[leonardoporro]

@furier Hi, thanks for the interest in the library, and good for trying to write the mappers! Adding support for hot chocolate makes sense. Unfortunately I’m sick now, but I can try something next weekend If I feel better And yes, the wiki needs more work it’s not 100 % completed

[leonardoporro]

credits

https://github.com/leonardoporro/Detached-Mapper/wiki/Partial-Updates