Question

I’ve got a method that is being passed a vehicleID – I need to get all the SalesChannels that contain that vehicle. The SalesChannels have an IEnumerable of SalesChannelVehicle which have a property called VehicleID.

I tried this but it brings back all the SalesChannels, not just the one I know my Vehicle is in!

var queryable = Session.Linq<SalesChannel>();
queryable.Where(y => y.SalesChannelVehicle.Any(z => z.VehicleId == vehicleId));

Can anyone assist please? I’m using NHibernate, though I doubt that makes much difference to this issue.

Answer 1

I believe that you have to assign the returned value to something so have something like;

var queryable = Session.Linq<SalesChannel>();
var results = queryable.Where(y => y.SalesChannelVehicle.Any(z => z.VehicleId == vehicleId));

EDIT by KeithS: The difference between this and the OP is that the results variable now contains the IQueryable that includes the Where() method’s addition to the expression tree. Simply calling the methods on queryable does not update queryable‘s expression tree in-place; you must assign the extended tree somewhere. If you wanted queryable to include the Where() clause, you can simply assign to the same variable:

var queryable = Session.Linq<SalesChannel>();
queryable = queryable.Where(y => y.SalesChannelVehicle.Any(z => z.VehicleId == vehicleId));

You can also inline the Where() method call:

var queryable = Session.Linq<SalesChannel>().Where(y => y.SalesChannelVehicle.Any(z => z.VehicleId == vehicleId));