EF Core and Automapper. Mapping relationship one-to-many - asp.net-core

Question

I'm currently using AutoMapper on an Project running code-first Entity Framework.
Here just simple entities and DTO's:
// DTO Profile
public class CreateOrEditProfileDto
{
public string Code { get; set; }
public string Name { get; set; }
public List<RouteDto> Routes { get; set; }
}
// entity Profile
public class Profile
{
public virtual string Code { get; set; }
public virtual string Name { get; set; }
}
// DTO Route
public class RouteDto
{
public string DriverName { get; set; }
public string DriverSurname { get; set; }
public string Phone { get; set; }
public string Email { get; set; }
public int ProfileId { get; set; }
}
//entity Route
public class Route
{
public virtual string DriverName { get; set; }
public virtual string DriverSurname { get; set; }
public virtual string Phone { get; set; }
public virtual string Email { get; set; }
public virtual int ProfileId { get; set; }
[ForeignKey("ProfileId")]
public Profile ProfileFk { get; set; }
}
//Mapper
configuration.CreateMap<RouteDto, Route>().ReverseMap();
// configuration.CreateMap<CreateOrEditProfileDto, Profile>().ReverseMap();
// this type of configuration give the error written below
configuration.CreateMap<CreateOrEditProfileDto, Profile>()
.ForMember(dest => dest, opt =>
opt.MapFrom(src => src.Routes.Select(x =>
new Route()
{
ProfileId = x.ProfileId,
DriverName = x.DriverName,
DriverSurname = x.DriverSurname,
Phone = x.Phone,
Email = x.Email,
}
)
)
);
I'm a little bit confusing, I'm trying to map one-to-many relationship between Profile and Route, Route has a foreign key to Profile. A single profile could have more routes. So, I want to create a profile and attach the list of routes, but when I compile the solution, I get this error:
AutoMapper.AutoMapperConfigurationException: 'Custom configuration for members is only supported for top-level individual members on a type.'
Does anyone know the best way to solve this mapping?
Regards

Answer 1

Because List<RouteDto> is mapped to Profile, the type does not match. You need to add a property in Profile.
public class Profile
{
public virtual string Code { get; set; }
public virtual string Name { get; set; }
public List<Route> Routes { get; set; }
}
The mapping attribute dest.Routes need to be specified. Then, the Routes will be automatically mapped.
CreateMap<CreateOrEditProfileDto, EntityProfile>()
.ForMember(dest => dest.Routes, opt =>
opt.MapFrom(src => src.Routes.Select(x=>
new Route()
{
ProfileId = x.ProfileId,
DriverName = x.DriverName,
DriverSurname = x.DriverSurname,
Phone = x.Phone,
Email = x.Email,
}
))
);