Why can't I map `ApplicationUser` to a view model with AutoMapper? - asp.net-mvc

Question

My ApplicationUser is fairly standard as generated by the MVC 5 project template, with the addition of FullName and the IPayCaddyEntity interface:
public class ApplicationUser : IdentityUser, IPayCaddyEntity
{
public async Task<ClaimsIdentity> GenerateUserIdentityAsync(UserManager<ApplicationUser> manager)
{
// Note the authenticationType must match the one defined in CookieAuthenticationOptions.AuthenticationType
var userIdentity = await manager.CreateIdentityAsync(this, DefaultAuthenticationTypes.ApplicationCookie);
// Add custom user claims here
return userIdentity;
}
public string FullName { get; set; }
}
The new interface is only:
public interface IPayCaddyEntity
{
string Id { get; set; }
}
and is already implemented by IdentityUser having a string Id property. Everything builds and mostly runs OK. Then I want to map a list of users to a viewmodel:
public class PlayerViewModel: PayCaddyViewModel
{
public string FullName { get; set; }
}
They should map nicely, both have the same type FullName property. I try this:
Mapper.CreateMap<ApplicationUser, PlayerViewModel>().ReverseMap();
Mapper.AssertConfigurationIsValid();
then this:
var players = _db.Users.ToList()
var model = Mapper.Map<IList<PlayerViewModel>>(players);
The Map call throws an exception.
I am trying to include the Identity entities in my own database, and the Users property is a DbSet<ApplicationUser that my DbContext inherits from IdentityDbContext<ApplicationUser>.
The full stack trace is:
[AutoMapperMappingException: Missing type map configuration or unsupported mapping.
Mapping types:
ApplicationUser -> PlayerViewModel
PayCaddy.Data.Models.ApplicationUser -> PayCaddy.Client.Models.PlayerViewModel
Destination path:
IList`1[0]
Source value:
System.Data.Entity.DynamicProxies.ApplicationUser_4342C7C6E2802320D156341C80F8DED74454F28D43628C766C6951DB971B9BDA]
AutoMapper.MappingEngine.AutoMapper.IMappingEngineRunner.Map(ResolutionContext context) +610
AutoMapper.Mappers.EnumerableMapperBase`1.Map(ResolutionContext context, IMappingEngineRunner mapper) +482
AutoMapper.Mappers.CollectionMapper.Map(ResolutionContext context, IMappingEngineRunner mapper) +126
AutoMapper.MappingEngine.AutoMapper.IMappingEngineRunner.Map(ResolutionContext context) +610
AutoMapper.MappingEngine.MapCore(Object source, Type sourceType, Type destinationType, MappingOperationOptions options) +179
AutoMapper.MappingEngine.Map(Object source, Type sourceType, Type destinationType, Action`1 opts) +59
AutoMapper.MappingEngine.Map(Object source, Action`1 opts) +92
AutoMapper.MappingEngine.Map(Object source) +93
AutoMapper.Mapper.Map(Object source) +62
PayCaddy.Client.Controllers.<PlayersIndex>d__11.MoveNext() in C:\Development\Cordova\PayCaddy\PayCaddy.Client\Controllers\AccountController.cs:65
System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) +99
System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) +58
System.Web.Mvc.Async.TaskAsyncActionDescriptor.EndExecute(IAsyncResult asyncResult) +97
System.Web.Mvc.Async.<>c__DisplayClass37.<BeginInvokeAsynchronousActionMethod>b__36(IAsyncResult asyncResult) +17
System.Web.Mvc.Async.WrappedAsyncResult`1.CallEndDelegate(IAsyncResult asyncResult) +10
System.Web.Mvc.Async.WrappedAsyncResultBase`1.End() +49
System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeActionMethod(IAsyncResult asyncResult) +32
System.Web.Mvc.Async.AsyncInvocationWithFilters.<InvokeActionMethodFilterAsynchronouslyRecursive>b__3d() +50
System.Web.Mvc.Async.<>c__DisplayClass46.<InvokeActionMethodFilterAsynchronouslyRecursive>b__3f() +225
System.Web.Mvc.Async.<>c__DisplayClass33.<BeginInvokeActionMethodWithFilters>b__32(IAsyncResult asyncResult) +10
System.Web.Mvc.Async.WrappedAsyncResult`1.CallEndDelegate(IAsyncResult asyncResult) +10
System.Web.Mvc.Async.WrappedAsyncResultBase`1.End() +49
System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeActionMethodWithFilters(IAsyncResult asyncResult) +34
System.Web.Mvc.Async.<>c__DisplayClass2b.<BeginInvokeAction>b__1c() +26
System.Web.Mvc.Async.<>c__DisplayClass21.<BeginInvokeAction>b__1e(IAsyncResult asyncResult) +100
System.Web.Mvc.Async.WrappedAsyncResult`1.CallEndDelegate(IAsyncResult asyncResult) +10
System.Web.Mvc.Async.WrappedAsyncResultBase`1.End() +49
System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeAction(IAsyncResult asyncResult) +27
System.Web.Mvc.Controller.<BeginExecuteCore>b__1d(IAsyncResult asyncResult, ExecuteCoreState innerState) +13
System.Web.Mvc.Async.WrappedAsyncVoid`1.CallEndDelegate(IAsyncResult asyncResult) +29
System.Web.Mvc.Async.WrappedAsyncResultBase`1.End() +49
System.Web.Mvc.Controller.EndExecuteCore(IAsyncResult asyncResult) +36
System.Web.Mvc.Controller.<BeginExecute>b__15(IAsyncResult asyncResult, Controller controller) +12
System.Web.Mvc.Async.WrappedAsyncVoid`1.CallEndDelegate(IAsyncResult asyncResult) +22
System.Web.Mvc.Async.WrappedAsyncResultBase`1.End() +49
System.Web.Mvc.Controller.EndExecute(IAsyncResult asyncResult) +26
System.Web.Mvc.Controller.System.Web.Mvc.Async.IAsyncController.EndExecute(IAsyncResult asyncResult) +10
System.Web.Mvc.MvcHandler.<BeginProcessRequest>b__5(IAsyncResult asyncResult, ProcessRequestState innerState) +21
System.Web.Mvc.Async.WrappedAsyncVoid`1.CallEndDelegate(IAsyncResult asyncResult) +29
System.Web.Mvc.Async.WrappedAsyncResultBase`1.End() +49
System.Web.Mvc.MvcHandler.EndProcessRequest(IAsyncResult asyncResult) +28
System.Web.Mvc.MvcHandler.System.Web.IHttpAsyncHandler.EndProcessRequest(IAsyncResult result) +9
System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +9723757
System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +155

Answer 1

Your problem must be the CreateMap not being called, since your code works fine as you can see in this .NET fiddle.
Double check if the CreateMap is being called properly. Try calling it in Application_Start() method, Global.asax.cs file.