Hello,
because we do not want to force it to be always the last, we want to keep a
"moving pointer" to the current one.
Thank you
Bruno
On Friday, August 10, 2012 2:01:07 PM UTC-3, fknebels wrote:
>
> I'm not sure why you are trying to do this in the mapping.
>
> If you just want the last vehicle added why not just map the
> CurrentVehicle property to something like this
>
> VehicleModel {
> get
> {
> return mVehicleModels[mVehicleModels.Count - 1];
> }
>
> Since you are populating this list already and you only need a reference
> to the last one in the list.
>
>
> On Fri, Aug 10, 2012 at 12:52 PM, Bruno Sanches
> <[email protected]<javascript:>
> > wrote:
>
>> I have a collection of items in one object and I need to keep reference
>> to the last added item to the collection, so I am doing like this:
>>
>> public class VehicleMap : BaseUniqueNamedEntityMap<Vehicle>
>>
>>
>>
>> {
>>
>>
>>
>> public VehicleMap():
>>
>>
>>
>> base("vehicle_id", 40)
>>
>>
>>
>> {
>>
>>
>>
>> Not.LazyLoad();
>>
>>
>>
>> //The main collection of items
>>
>>
>>
>> HasMany(x => x.mVehicleModels)
>>
>>
>>
>>
>> .OrderBy("date asc")
>>
>>
>>
>> .Cascade.AllDeleteOrphan()
>>
>>
>>
>> .LazyLoad()
>>
>>
>>
>> .KeyColumn("vehicle_id");
>>
>>
>>
>> //Always updated to the last added item
>>
>>
>>
>> References(x => x.mCurrentModel)
>>
>>
>>
>> .Column("current_vehicle_model_relation_id")
>>
>>
>>
>> .Cascade.None()
>>
>>
>>
>> .Not.Nullable();
>>
>>
>>
>> }
>>
>>
>>
>> }
>>
>>
>> And the Vehicle class looks like this:
>>
>> public class Vehicle : BaseUniqueNamedEntity
>>
>>
>> {
>>
>>
>>
>> private IList<VehicleModelItem> mVehicleModels = new
>> List<VehicleModelItem>();
>>
>>
>>
>> [NotNull()]
>>
>>
>>
>> private VehicleModelItem mCurrentModel;
>>
>>
>>
>> public VehicleModel Model
>>
>>
>>
>> {
>>
>>
>>
>> get { return mCurrentModel.VehicleModel; }
>>
>>
>>
>> set
>> {
>>
>>
>>
>> //Check null before checking if values change, so we catch
>> exceptions on constructor also
>>
>>
>>
>> if (value == null)
>>
>>
>>
>> throw new ArgumentNullException("Vehicle model cannot be
>> null");
>>
>>
>>
>> //When model is set, we update current model and insert it
>> on list
>>
>>
>>
>> mCurrentModel = new VehicleModelItem(this, value);
>>
>>
>>
>> mVehicleModels.Add(mCurrentModel);
>>
>>
>>
>> value.AddVehicleModelItem(mCurrentModel);
>>
>>
>>
>> }
>>
>>
>>
>> }
>>
>>
>> }
>>
>>
>> VehicleModelItem mapping:
>>
>> public VehicleModelItemMap() :
>>
>>
>>
>> base("vehicle_model_relation_id")
>>
>>
>>
>> {
>>
>>
>>
>> Not.LazyLoad();
>>
>>
>>
>> References(x => x.mVehicleModel)
>>
>>
>>
>> .Column("vehicle_model_id")
>>
>>
>>
>> .Cascade.None()
>>
>>
>>
>> .LazyLoad(Laziness.Proxy)
>>
>>
>>
>> .Not.Nullable();
>>
>>
>>
>> Map(x => x.mDate)
>>
>>
>>
>> .Column("date")
>>
>>
>>
>> .Not.Nullable();
>>
>>
>>
>> }
>>
>>
>> The problem is, if I create a new vehicle, like:
>>
>> Vehicle vehicle = new Vehicle();
>>
>>
>>
>> vehicle.Model = anyExitingVehicleModel;
>>
>>
>>
>> session.save(vehicle);
>>
>>
>> I get an "null or transient object set to not null property", in this
>> case for the property Vehicle in the VehicleModelItem.
>>
>> The problem is related to the mCurrenveVehicleModel property in vehicle,
>> if I removed it, everything works find, but I could not track the last
>> added item (at least not by this way).
>>
>> Is there anyway that I can make this work without needing to call save
>> for both the VehicleModelItem and vehicle?
>>
>> I tried several combinations of Cascade on those collections, but without
>> success.
>>
>> Thank you
>> Bruno Sanches
>> ========================
>> http://www.pontov.com.br
>>
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>
>
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