[nhibernate-issues] [NHJIRA] Commented: (NH-2690) Linq Select() broken with .ToFuture()

[Vasile B. (JIRA) <nh...@gm...>]

    [ http://216.121.112.228/browse/NH-2690?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=21041#action_21041 ] 

Vasile Bujac commented on NH-2690:
----------------------------------

The combination of .ToFuture() and .Fetch(p => p.Related) doesn't work because the .Fetch() returns a NhFetchRequest<T> (derived from QuerableBase<T>) and .ToFuture() expects a NhQueryable<T> (also derived from QueryableBase<T>) - a cast is performed when calling .ToFuture(). This is a distinct problem, I think there is a related issue NH-2422 (http://216.121.112.228/browse/NH-2422).

I've also run into the "projection and .ToFuture() problem", it is definetely a show stopper. Also I've experienced a similar bug when using .ToFuture() and another type of projection using AliasToBeanTransformer of predefined classes on hql query api (i think it says it was resolved, but nevertheless I've run into this problem with NH 3.1)


> Linq Select() broken with .ToFuture()
> -------------------------------------
>
>                 Key: NH-2690
>                 URL: http://216.121.112.228/browse/NH-2690
>             Project:  NHibernate
>          Issue Type: Bug
>          Components: Linq Provider
>    Affects Versions: 3.1.0
>            Reporter: Kelly Stuard
>            Priority: Major
>         Attachments: NH2690.zip
>
>
> //Given the following:
> var query =
> 	from cat in session.Query<Cat>()
> 	select new
> 	{
> 		Id = cat.Id,
> 		Name = cat.Name,
> 	};
> //This works:
> var result1 = query.ToList();
> //But this does not:
> var queryResults = query.ToFuture().ToList();
> Exception:
> NHibernate.HibernateException was unhandled
>   Message=Failed to execute multi query: [select cat0_.Id as col_0_0_, cat0_.Name as col_1_0_ from Cat cat0_;
> ]
>   Source=NHibernate
>   StackTrace:
>        at NHibernate.Impl.MultiQueryImpl.DoList()
>        at NHibernate.Impl.MultiQueryImpl.ListIgnoreQueryCache()
>        at NHibernate.Impl.MultiQueryImpl.List()
>        at NHibernate.Impl.FutureQueryBatch.GetResultsFrom(IMultiQuery multiApproach)
>        at NHibernate.Impl.FutureBatch`2.GetResults()
>        at NHibernate.Impl.FutureBatch`2.get_Results()
>        at NHibernate.Impl.FutureBatch`2.GetCurrentResult[TResult](Int32 currentIndex)
>        at NHibernate.Impl.FutureBatch`2.<>c__DisplayClass4`1.<GetEnumerator>b__3()
>        at NHibernate.Impl.DelayedEnumerator`1.<get_Enumerable>d__0.MoveNext()
>        at System.Collections.Generic.List`1..ctor(IEnumerable`1 collection)
>        at System.Linq.Enumerable.ToList[TSource](IEnumerable`1 source)
>        at NHibernate.Test.NHSpecificTest.NH1234.SampleTest.ShouldBeAbleToFutureSelectOntoAnonymous() in C:\Users\kstuard\Desktop\NH2540\NHibernate.Test\NHSpecificTest\NH1234\SampleTest.cs:line 97
>        at ConsoleApplication2.Program.Main(String[] args) in C:\Users\kstuard\Desktop\NH2540\ConsoleApplication2\Program.cs:line 16
>        at System.AppDomain._nExecuteAssembly(RuntimeAssembly assembly, String[] args)
>        at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
>        at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean ignoreSyncCtx)
>        at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
>        at System.Threading.ThreadHelper.ThreadStart()
>   InnerException: System.ArgumentException
>        Message=The value "System.Object[]" is not of type "<>f__AnonymousType0`2[System.Int32,System.String]" and cannot be used in this generic collection.
> Parameter name: value
>        Source=mscorlib
>        ParamName=value
>        StackTrace:
>             at System.ThrowHelper.ThrowWrongValueTypeArgumentException(Object value, Type targetType)
>             at System.Collections.Generic.List`1.System.Collections.IList.Add(Object item)
>             at NHibernate.Impl.MultiQueryImpl.DoList()
>        InnerException: 
> This works fine if I select directly to typeof(Cat). Future is such a wonderful tool; it would be great if it worked in this scenario.
> I will attach test cases used to generate this exception, shortly.

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