WCF Data Services supports projections (server-side, not client-side,
this you can always do with LINQ to Objects), but you have to enable
them:
public static void InitializeService(DataServiceConfiguration config)
{
config.DataServiceBehavior.MaxProtocolVersion =
DataServiceProtocolVersion.V2;
config.DataServiceBehavior.AcceptProjectionRequests = true;
...
}
Also, I wrote a post on WCF Data Services debugging, a long time ago:
http://weblogs.asp.net/ricardoperes/archive/2009/11/01/debugging-ado-net-data-services.aspx
RP
On May 9, 2:47 pm, Vagif Abilov <[email protected]> wrote:
> Hi,
>
> After resolving my issue with navigation to referenced entities (thanks
> Ricardo), I am now testing possibility to fetch in OData only referenced
> entities. The following query fetches main entity and it's Products
> relation:
> Categories.Expand("Products").Where(c => c.CategoryID == 1)
> (corresponds
> tohttp://localhost:50555/NorthwindEntityFrameworkModelFirstMsSql.svc/Ca...
> )
>
> This is not what I want: I only need Products. I don't want to do projection
> on the client.
>
> When using Entity Framework, I can use the following (weird) C# syntax in
> client code:
> from c in Categories.Where(c => c.CategoryID == 1) select new { Products =
> c.Products }
>
> But this does not work in NHibernate! I am getting NotImplemented exception:
>
> <message xml:lang="nb-NO">Not Implemented</message>
> <innererror>
> <message>([100001] As Categories)</message>
> <type>System.NotSupportedException</type>
> ...
> </message>
>
> And using Expand("Products") does not seem to support projections:
> Categories.Expand("Products").Where(c => c.CategoryID == 1).Select(x =>
> x.Products) results in "The method 'Select' is not supported." both for
> NHibernate and Entity Framework.
>
> Do you know about any workaround for this that will work in NHibernate?
>
> Thanks in advance
>
> Vagif
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