IMapper.map() function return null values object. Automapper issue
asp.net-core automapper c# entity-framework-core
Question
I was coding a web API, wanted to map User model to UserView model. Debugging confirms mapper.Map(user) returns null value object. mapper is an instance of IMapper Class of AutoMapper.
public class User
{
public Guid Id { get; set; }
public string Name { get; set; }
public string Password { get; set; }
public string Email { get; set; }
public UserRole? Role { get; set; }
}
public class UserView
{
public Guid Id { get; }
public string Name { get; }
public string Email { get; }
public UserRole? Role { get; }
}
public class MappingProfiles : Profile
{
public MappingProfiles()
{
CreateMap<User, UserView>();
}
}
//In startup.cs
services.AddAutoMapper();
//In user service class.
var userView = _mapper.Map<UserView>(user);
The output looks like this.
{
"id": "00000000-0000-0000-0000-000000000000",
"name": null,
"email": null,
"role": null
}
Accepted Answer
The UserView model only has getters. If you want to keep them readonly, you can do the following
Add a constructor to UserView
public class UserView
{
public Guid Id { get; }
public string Name{ get; }
public string Email { get; }
public UserRole? Role { get; }
public UserView(Guid id, string name, string email, UserRole role)
{
Id = id;
Name = name;
Email = email;
Role = role;
}
}
Also adjust the mapping profile
public class MappingProfiles : Profile
{
public MappingProfiles()
{
CreateMap<User, UserView>()
.ConstructUsing(src => new UserView(src.Id, src.Name, src.Email, src.UserRole));
}
}
The simplest way would be to add setters to all properties of UserView.
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