LS4: Could not locate reverse association model

Hi there,

I get this exception:

Mindscape.LightSpeed.LightSpeedException was unhandled by user code
  Message=Could not locate reverse association model
  Source=Mindscape.LightSpeed.Linq
  StackTrace:
       bei Mindscape.LightSpeed.Linq.Sqo.SelectMany.DeriveBackReferencePath(Type parentType, Type childType, Expression expression, Expression projectorToIgnore)
       bei Mindscape.LightSpeed.Linq.Sqo.SelectMany.DeriveBackReferencePath(Type parentType, Type childType, Expression expression, Expression projectorToIgnore)
       bei Mindscape.LightSpeed.Linq.Sqo.SelectMany.DeriveBackReferencePath(Type parentType, Type childType, Expression expression, Expression projectorToIgnore)
       bei Mindscape.LightSpeed.Linq.Sqo.SelectMany.EvaluateSingleArgument(ExpressionVisitor visitor, MethodCallExpression expression)
       bei Mindscape.LightSpeed.Linq.Sqo.SelectMany.Evaluate(ExpressionVisitor visitor, MethodCallExpression expression)
       bei Mindscape.LightSpeed.Linq.Plan.LinqQueryBuilder.VisitMethodCall(MethodCallExpression exp)
       bei Mindscape.LightSpeed.Linq.Plan.LinqQueryBuilder.Visit(Expression exp)
       bei Mindscape.LightSpeed.Linq.Sqo.Select.Evaluate(ExpressionVisitor visitor, MethodCallExpression expression)
       bei Mindscape.LightSpeed.Linq.Plan.LinqQueryBuilder.VisitMethodCall(MethodCallExpression exp)
       bei Mindscape.LightSpeed.Linq.Plan.LinqQueryBuilder.Visit(Expression exp)
       bei Mindscape.LightSpeed.Linq.Plan.LinqQueryBuilder.Build(Expression translation, LinqQueryProvider provider)
       bei Mindscape.LightSpeed.Linq.LinqQueryProvider.GetExecutionPlan(Expression expression)
       bei Mindscape.LightSpeed.Linq.LinqQueryProvider.Execute(Expression expression)
       bei Mindscape.LightSpeed.Linq.LinqQueryProvider.System.Linq.IQueryProvider.Execute(Expression expression)
       bei Mindscape.LightSpeed.Linq.LinqQuery`1.GetEnumerator()
       bei System.Collections.Generic.List`1..ctor(IEnumerable`1 collection)
       bei System.Linq.Enumerable.ToList[TSource](IEnumerable`1 source)
       bei LSTests.Permissions.GetPermissions_ShouldGetPermissions()

I use the version 4.0.534.17874

Can please you have look what is going wrong here? Test project

Thanks for reporting this.  We're not yet sure why it's happening, but it appears to be something to do with the use of covariance in the type of the returned query.  If you change this:

IQueryable<UserIdentity> getUser = UnitOfWork.UserNameIdentities...

to

IQueryable<UserNameIdentity> getUser = UnitOfWork.UserNameIdentities...

then this resolves the error.

Thanks for the tip.