[ http://216.121.112.228/browse/NH-2688?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=21150#action_21150 ]
Andrew Michell commented on NH-2688:
------------------------------------
Any updates on this issue?
It is also blocking my team from using NHibernate as a linq provider for WCF data services.
dabuddhaman, as a workaround it might be possible to wrap the NHibernate linq provider with your own provider so you can inspect the expression tree and remove the convert expression.
> SelectMany with cast throws QuerySyntaxException
> ------------------------------------------------
>
> Key: NH-2688
> URL: http://216.121.112.228/browse/NH-2688
> Project: NHibernate
> Issue Type: Bug
> Components: Linq Provider
> Affects Versions: 3.2.0Alpha2
> Reporter: dabuddhaman
> Priority: Major
> Attachments: SelectManyWithCastThrowsQuerySyntaxException.cs
>
>
> When trying to implement WCF dataservices using NHibernate I had a blocking error.
> the call to
> http://localhost:32774/NorthWindNHibernateDataService.svc/Orders(4)/OrderLines
> generated the following Linq query
> db.Orders.Where(element => element.OrderId == 4).SelectMany(element => (IEnumerable<OrderLine>)element.OrderLines)
> //{value(NHibernate.Linq.NhQueryable`1[OrderLines]).Where(element => (element.OrderId == 4)).SelectMany(element => Convert(element.OrderLines))}
> which throws a QuerySyntaxException
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