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AutoMapper Two-way mapping
Mapper.CreateMap<Design, DesignSubmitViewModel>()
.ForMember(d => d.Tags, opt => opt.MapFrom(d => d.Tags.Aggregate("", (total, tag) => total + (tag.Name + ", ")).Trim(' ',',')));
Mapper.CreateMap<DesignSubmitViewModel, Design>()
.ForMember(d => d.Competition, opt => opt.Ignore())
.ForMember(d => d.Tags, opt => opt.MapFrom(d => d.Tags.Split(',').Select(name => new Tag() { Name = name.Trim() })));
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