gistfile1.txt

using System.Linq;
using FastExpressionCompiler;
using Mapster;

namespace foobar;

public static class MappingConfiguration
{
    public static TypeAdapterConfig Generate()
    {
        var config = new TypeAdapterConfig();

        config.NewConfig<foo, bar>()
            .Map(dest => dest.Color,
                src => src.Category.Color)
            .Map(dest => dest.CategorySlug,
                src => src.Category.Slug)
            .Ignore(dest => dest.Reactions);

        config.NewConfig<lol, asd>();

        config.Compiler = exp => exp.CompileFast();
        config.Compile();

        return config;
    }
}

### ON STARTUP ###
//register mapster
var config = MappingConfiguration.Generate();

services.AddSingleton(config);
services.AddSingleton<IMapper, ServiceMapper>();