How to fix the unmapped members? - asp.net

Question

I am building a new project for browsing through movies and giving your opinion for them. Now I am on the administration part and I added functionality for adding a movie but when I try to add a movie the automapper throws exception for unmapped members on the service where I am mapping dto to data model. The members are from the base data model for example the id.
EDIT:
I tried to ignore all the members that make this exception, also tried to made a constructor with no arguments but doesn't work.
// Initialization
Mapper.Initialize(conf =>
{
conf.CreateMap<Movie, MovieDto>();
conf.CreateMap<MovieDto, Movie>();
conf.CreateMap<MovieDto, MovieViewModel>();
});
// Base Data Model
public class DataModel
{
[Key]
public int Id { get; set; }
[DataType(DataType.DateTime)]
public DateTime? CreatedOn { get; set; }
[DataType(DataType.DateTime)]
public DateTime? ModifiedOn { get; set; }
public bool IsDeleted { get; set; }
[DataType(DataType.DateTime)]
public DateTime? DeletedOn { get; set; }
}
// Movie Data Model
public class Movie: DataModel
{
public Movie(string title, double rating, string duration, string type, string description, DateTime releaseDate, string producer)
{
this.Title = title;
this.Rating = rating;
this.Duration = duration;
this.Type = type;
this.Description = description;
this.ReleaseDate = releaseDate;
this.Producer = producer;
}
// successfully mapped members
}
// Movie DTO
public class MovieDto
{
public string Title { get; set; }
public double Rating { get; set; }
public string Duration { get; set; }
public string Type { get; set; }
public string Description { get; set; }
public DateTime ReleaseDate { get; set; }
public string Producer { get; set; }
}
// Add functionality
public void AddMovie(MovieDto movie)
{
//execption here
var movieDM = this.mapper.Map<Movie>(movie);
this.repo.Add(movieDM);
this.saver.SaveChanges();
}
This is the exception on img: https://i.imgur.com/RGZP6NP.png

Answer 1

Got it to work by doing the following.
Firstly, since DataModel is a base class, I followed automapper's mapping inheritance (see docs).
Then since you are using a mapper instance to map this.mapper.Map<Movie>(movie), the configuration needs to be instance rather than static as well, and I use the AutoMapper.Extensions.Microsoft.DependencyInjection nuget package for this, which allows registering Automapper with the IoC container.
My configuration looks like this (inside the ConfigureServices method of the Startup class).
services.AddAutoMapper(conf =>
{
conf.CreateMap<object, DataModel>()
.ForMember(d => d.Id, opts => opts.Ignore())
.ForMember(d => d.CreatedOn, opts => opts.MapFrom(_ => DateTime.Now))
.ForMember(d => d.ModifiedOn, opts => opts.MapFrom(_ => DateTime.Now))
.ForMember(d => d.DeletedOn, opts => opts.MapFrom(_ => (DateTime?)null))
.ForMember(d => d.IsDeleted, opts => opts.MapFrom(_ => false))
.Include<MovieDto, Movie>();
conf.CreateMap<Movie, MovieDto>();
conf.CreateMap<MovieDto, Movie>();
});
Note that I used CreateMap<object, DataModel> for the base class mapping and just used hardcoded values for dates there, feel free to adjust to suit your scenario.
After injecting an instance of IMapper, I was able to call this.mapper.Map<Movie>(movie) successfully.
Hope this sets u off in a good direction.

Answer 2

You can specify that AutoMapper should not validate that all properties are being mapped. The MemberList enum can be used for this when creating the mapping configuration. For example:
conf.CreateMap<MovieDto, Movie>(MemberList.None)
The error in the screenshot however indicates that another mapping is problematic, the one from MovieViewModel to MovieDto. I suggest you add a mapping configuration for these types as well:
conf.CreateMap<MovieViewModel, MovieDto>(MemberList.None)

Answer 3

You could try Profile Instances.
public class AutoMapperProfile : Profile
{
public AutoMapperProfile()
{
CreateMap<OrderViewModel, Order>()
.ForMember(dest => dest.OrderItem, opt => opt.MapFrom(src => src.OrderItemViewModel));
CreateMap<OrderItemViewModel, OrderItem>();
CreateMap<Order, Order>()
.ForMember(dest => dest.Id, opt => opt.Ignore());
CreateMap<Movie, MovieDto>();
CreateMap<MovieDto, Movie>();
}
}
Here is the working demo AutoMapperProfile