CODEWITHSUNDEEP
c#polymorphismautomapperiqueryable
DharmaTurtle
DharmaTurtle

Reputation: 8467

Can't get Automapper to return the derived type when the input is IQueryable

I can get Automapper's .Map to return the derived type, but not in an IQueryable.

Data structure:

public class Order { }
public class OnlineOrder : Order { }
public class MailOrder : Order { }

public class OrderDto { }
public class OnlineOrderDto : OrderDto { }
public class MailOrderDto : OrderDto { }

Setup (~copied from documentation):

var mapperConfiguration = new MapperConfiguration(cfg =>
{
    cfg.CreateMap<Order, OrderDto>()
        .Include<OnlineOrder, OnlineOrderDto>()
        .Include<MailOrder, MailOrderDto>();
    cfg.CreateMap<OnlineOrder, OnlineOrderDto>();
    cfg.CreateMap<MailOrder, MailOrderDto>();
});

var order = new OnlineOrder();
var orders = new List<Order> { order }.AsQueryable();

var mapper = mapperConfiguration.CreateMapper().Map<OrderDto>(order); // is of type OnlineOrderDto, it works!

What I've tried:

var projectTo = orders.ProjectTo<OrderDto>(mapperConfiguration); // is of type OrderDto, boo!
var useAsDataSource = orders.UseAsDataSource(mapperConfiguration).For<OrderDto>(); // is of type OrderDto, boo!

I've looked at documentation, this answer, the queryable extensions, and some answers involving LINQ. I feel like I'm missing something obvious.

Upvotes: 2

Views: 141

Answers (1)

Tyson Williams
Tyson Williams

Reputation: 1725

I don't think it is possible. See this closed bug report: https://github.com/AutoMapper/AutoMapper/issues/701

Upvotes: 2

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