自动映射器子实体未映射

Question

Im trying to map a parent entity that includes a default child entity.

So, I have a promotion object, that has a collection of localisedPromotion objects

I want to set a specific localisedPromotion and set it as my defaultLocalisedPromotion

In my config I have:

config.CreateMap<LocalisedPromotion, LocalisedPromotionViewModel>()
    .ForMember(dest => dest.LocalisedPromotionId, o => o.MapFrom(src => src.Id));

config.CreateMap<Promotion, PromotionViewModel>()
    .ForMember(dest => dest.DefaultLocalisedPromotion,
               o => o.MapFrom(src => src.LocalisedPromotions
                                        .FirstOrDefault(x => x.CultureId == src.DefaultCultureId)));

So in my mind this should set the field DefaultLocalisedPromotion of type LocalisedPromotionViewModel

However the field is always null

Is there an obvious way of doing what I am trying to achieve

Answer 1

I wrote a unit test and it seems that the AutoMapper code works. Please review the unit test and let me know if it is correct or post more code (especially the classes you want to map) so that the test can be adapted.

using AutoMapper;
using Xunit;

using System.Linq;
using System.Collections.Generic;

namespace AutoMapperTest
{
    public class LocalisedPromotion
    {
        public int Id;
        public int CultureId;
    }

    public class LocalisedPromotionViewModel
    {
        public int LocalisedPromotionId;
    }

    public class Promotion
    {
        public List<LocalisedPromotion> LocalisedPromotions;
        public int DefaultCultureId;
    }

    public class PromotionViewModel
    {
        public LocalisedPromotionViewModel DefaultLocalisedPromotion;
    }

    public class AutoMapperTest
    {
        [Fact]
        public void Test()
        {
            var theConfig = new MapperConfiguration(config =>
            {
                config.CreateMap<LocalisedPromotion, LocalisedPromotionViewModel>()
                    .ForMember(dest => dest.LocalisedPromotionId, o => o.MapFrom(src => src.Id));

                config.CreateMap<Promotion, PromotionViewModel>()
                    .ForMember(dest => dest.DefaultLocalisedPromotion,
                               o => o.MapFrom(src => src.LocalisedPromotions
                                                        .FirstOrDefault(x => x.CultureId == src.DefaultCultureId)));
            });

            var promotion = new Promotion { DefaultCultureId = 3 };
            promotion.LocalisedPromotions = new List<LocalisedPromotion>() { new LocalisedPromotion() { Id = 1, CultureId = 3 } };

            var result = theConfig.CreateMapper().Map<Promotion, PromotionViewModel>(promotion);

            Assert.NotNull(result.DefaultLocalisedPromotion);
            Assert.Equal(result.DefaultLocalisedPromotion.LocalisedPromotionId, 1);
        }
    }
}