Automapper through relations in Entity Framework - automapper

Question

As a newbie to automapper (v10.0.0) I'm trying to replace one of my queries. I currently use this to generate my response:
var query = from a in _context.ApprovalStatuses.AsNoTracking()
.Include(x => x.ApprovalOrder).ThenInclude(x => x.Worker)
where a.RequestId == request.Id
orderby a.ApprovalOrder.Position
let w = a.ApprovalOrder.Worker
select new RequestApprovalStatusDTO {
AssignedUtc = a.AssignedUtc,
Comments = a.Comments,
DecisionDateUtc = a.ApprovedDateUtc ?? a.RejectedDateUtc,
Email = w.Email,
Name = w.Name,
Uuid = a.Uuid
};
So I started by creating my mapping in my Profile subclass:
CreateMap<ApprovalStatus, RequestApprovalStatusDTO>()
.ForMember(x => x.DecisionDateUtc, x => x.MapFrom(y => y.ApprovedDateUtc ?? y.RejectedDateUtc))
.ForMember(x => x.Email, x => x.MapFrom(y => y.ApprovalOrder.Worker.Email))
.ForMember(x => x.Name, x => x.MapFrom(y => y.ApprovalOrder.Worker.Name));
And then I rewrote the query like so:
var query = _context.ApprovalStatuses
.Include(x => x.ApprovalOrder)
.ThenInclude(x => x.Worker)
.Where(x => x.RequestId == request.Id)
.OrderBy(x => x.ApprovalOrder.Position);
return Ok(_mapper.Map<RequestApprovalStatusDTO>(query));
At runtime, it's telling me
AutoMapperMappingException: Missing type map configuration or unsupported mapping.
Mapping types:
Object -> RequestApprovalStatusDTO
System.Object -> BoltOn.RequestApprovalStatusDTO
lambda_method(Closure , object , RequestApprovalStatusDTO , ResolutionContext )
I understand it's telling me that it doesn't know how to convert from object, but I'm not sure why it's trying to do that since query is an IOrderedQueryable<ApprovalStatus>.

Answer 1

Thanks to Lucian's pointer I was able to solve it like so:
var query = _context.ApprovalStatuses
.Where(x => x.Request.Uuid == uuid)
.OrderBy(x => x.ApprovalOrder.Position);
var approvals = await _mapper.ProjectTo<RequestApprovalStatusDTO>(query).ToArrayAsync();
if (approvals.Length == 0)
return NotFound();
return Ok(approvals);