Question

How to map User class to UserModel class using Emit Mapper?

    public class User
    {
        public Guid Id { get; set; }

        public string FirstName { get; set; }

        public string LastName { get; set; }

        public IList<Role> Roles { get; set; }

        public Company Company { get; set; }        
    }

    public class UserModel
    {
        public Guid Id { get; set; }

        public Guid CompanyId { get; set; }

        public string FirstName { get; set; }

        public string LastName { get; set; }      

        public IList<RoleModel> Roles { get; set; }
}

There several problems:

• I need to flatten the object such that I will have CompanyId instead of the Company object.
• Company object has property Id, in the UserModel I have CompanyId which corresponds to the company id, but property names do not match.
• I need to map List<Role> to List<RoleModel>

Answer 1

• For flattering I was using configuration from the samples in Emit Mapper source files: http://emitmapper.codeplex.com/SourceControl/changeset/view/69894#1192663

• To make the names to match in Company class should be the field with the name Id

• For mapping List<Role> to List<RoleModel> I was using custom converter:

  public class EntityListToModelListConverter<TEntity, TModel>
  {
      public List<TModel> Convert(IList<TEntity> from, object state)
      {
          if (from == null)
              return null;
  
          var models = new List<TModel>();
          var mapper = ObjectMapperManager.DefaultInstance.GetMapper<TEntity, TModel>();
  
          for (int i = 0; i < from.Count(); i++)
          {
              models.Add(mapper.Map(from.ElementAt(i)));
          }
  
          return models;
      }
  }
  

  So all together:

   var userMapper = ObjectMapperManager.DefaultInstance.GetMapper<User, UserModel>( 
               new FlatteringConfig().ConvertGeneric(typeof(IList<>), typeof(IList<>), 
               new DefaultCustomConverterProvider(typeof(EntityListToModelListConverter<,>))));
  

• There is a problem, using Flatterning Configuration with Custom converters, check my question: Emit Mapper Flattering with Custom Converters