Difficulty with unflattening a model (RMG016, RMG020)

[sander1095]

Hello!

I'm trying to map the following but this doesn't work. I can't really understand why.

// Source
public class Order
{
    public required int Id { get; set; }

    public required string CustomerId { get; set; }
}

// Target
public class OrderDto
{
    public required int Id { get; set; }
    public required OrderCustomerDto Customer { get; set; }
}

public class OrderCustomerDto
{
    public required string Id { get; set; }
}

[Mapper]
public static partial class OrderDtoMapper
{
    [MapProperty("CustomerId", "Customer.Id")]
    public static partial OrderDto ToResponseModel(this Order order);
}

I get the following errors:

• RMG016 Cannot map to init only member path Uitgekookt.Orderpick.API.Models.BoxScanner.OrderCustomerDto.Customer.Id
• RMG020 The member CustomerId on the mapping source type Order is not mapped to any member on the mapping target type OrderDto.

If I remove the required keyword from public required OrderCustomerDto Customer { get; set; }, the errors are gone, but the generated code will generate a nullref:

// namespace info has been removed for privacy reasons
public static partial OrderDto ToResponseModel(this Order order)
{
    var target = new OrderDto()
    {
        Id = order.Id,
    };
    target.Customer.Id = order.CustomerId;
    return target;
}

I also think the MapProperty should not be necessary because doesn't mapperly use pascalcase to understand mappings?

To summarize:

• Why does this not work?
• What needs to be done to make this work?

Thanks! <3

[latonz]

Why does this not work?

Unfortunately unflattening to init/required properties is not supported atm: #643.

What needs to be done to make this work?

A PR implementing this feature, feel free to contribute 😉