Unflatten record with primary constructor

[VeryPaul]

public record Foo(int Id, string Filter1, string Filter2);
public record Bar(int Id, Filters Filters);
public record Filters(string Filter1, string Filter2);

When I try to map Foo to Bar, the generated code tries to instanciate a Filters class, then assign its properties. However, it should use the primary constructor. What is the proper way to do it?

[Mapper(RequiredMappingStrategy = RequiredMappingStrategy.Both)]
internal partial class Mapper
{
    [MapProperty(nameof(Foo.Filter1), nameof(@Bar.Filters.Filter1))]
    [MapProperty(nameof(Foo.Filter2), nameof(@Bar.Filters.Filter2))]
    public partial Bar Map(Foo foo);
}

generated code:

// <auto-generated />
#nullable enable
namespace MapperlyPrimary
{
    [global::System.CodeDom.Compiler.GeneratedCode("Riok.Mapperly", "4.3.1.0")]
    internal partial class Mapper
    {
        [global::System.CodeDom.Compiler.GeneratedCode("Riok.Mapperly", "4.3.1.0")]
        public partial global::MapperlyPrimary.Bar Map(global::MapperlyPrimary.Foo foo)
        {
            var target = new global::MapperlyPrimary.Bar()
            {
                Id = foo.Id,
            };
            return target;
        }
    }
}

The Bar constructor is wrong btw, since it should use the primary constructor, but I assume it's because it doesn't know how to map the other properties.
If I remove Filters Filters from Bar, it calls the primary constructor.

[VeryPaul]

No clue?

[latonz]

It looks like the source and target parameters in the MapProperty attribute might be swapped. Have you tried reversing them to see if that resolves the issue? Also, are there any diagnostics being reported?

[VeryPaul]

According to the inline documentation and source code:

    //
    // Summary:
    //     Maps a specified source property to the specified target property.
    //
    // Parameters:
    //   source:
    //     The name of the source property. The use of `nameof()` is encouraged. A path
    //     can be specified by joining property names with a '.'.
    //
    //   target:
    //     The name of the target property. The use of `nameof()` is encouraged. A path
    //     can be specified by joining property names with a '.'.
    public MapPropertyAttribute(string source, string target)

Since I'm mapping a Foo towards a Bar,

    [MapProperty(nameof(Foo.Filter1), nameof(@Bar.Filters.Filter1))]
    [MapProperty(nameof(Foo.Filter2), nameof(@Bar.Filters.Filter2))]

is correct since I'm trying to put Foo.Filter1 into Bar.Filters.Filter1

(I tried reversing the parameters, but it makes no sense and doesn't compile of course).

With the code provided in the original post, I have these errors:

Severity	Code	Description	Project	File	Line	Suppression State
Error (active)	CS7036	There is no argument given that corresponds to the required parameter 'Id' of 'Bar.Bar(int, Filters)'	MapperlyTest	C:\Program Files\Microsoft Visual Studio\18\Community\Common7\IDE\Mapper.g.cs	10
Error (active)	RMG013	MapperlyTest.Bar has no accessible constructor with mappable arguments	MapperlyTest	C:\Users\xxxx\source\repos\MapperlyTest\MapperlyTest\Mapper.cs	12
Error (active)	RMG016	Cannot map to init only member path MapperlyTest.Bar.Filters.Filter1	MapperlyTest	C:\Users\xxxx\source\repos\MapperlyTest\MapperlyTest\Mapper.cs	12
Error (active)	CS7036	There is no argument given that corresponds to the required parameter 'Id' of 'Bar.Bar(int, Filters)'	MapperlyTest	C:\Users\xxxx\source\repos\MapperlyTest\MapperlyTest\obj\Debug\net10.0\Riok.Mapperly\Riok.Mapperly.MapperGenerator\Mapper.g.cs	10