[fluent-nhib] Fluent NHibernate Inhertiance Mapping with Hierarchy

[mbag]

I'm having trouble mapping the following setup in FNH.  Any help would
be appreciated.


        /***** Classes for Item Hierarchy  *****/

        public class ItemA
        {
                public string AProperty { get; set; }
        }

        public class ItemB : ItemA
        {
                public string BProperty { get; set; }
        }

        public class ItemC : ItemB
        {
                public string CProperty { get; set; }
        }

        public class ItemD : ItemB
        {
                public string DProperty { get; set; }
        }

        /***** Tables for Item Hierarchy  *****/

        TABLE A (ItemID INT, ItemTypeID INT, AProperty VARCHAR(100))
        TABLE A (ItemID INT, ItemTypeID INT, BProperty VARCHAR(100))
        TABLE A (ItemID INT, ItemTypeID INT, CProperty VARCHAR(100))
        TABLE A (ItemID INT, ItemTypeID INT, DProperty VARCHAR(100))

        /***** ItemTypeID to Class  *****/

        ItemTypeID = 1 --> ItemA
        ItemTypeID = 2 --> ItemB
        ItemTypeID = 3 --> ItemC

        ItemTypeID = 4 --> ItemD
        ItemTypeID = 5 --> ItemD


        /***** ItemTypeID to Table  *****/


        ItemTypeID = 1 --> Data is in Table A
        ItemTypeID = 2 --> Data is in Table A Join B
        ItemTypeID = 3 --> Data is in Table A Join B Join C

        ItemTypeID = 4 --> Data is in Table A Join B Join D
        ItemTypeID = 5 --> Data is in Table A Join B Join D


I would like to use a Discriminator column (ItemTypeID) but the
SubClassMap<ItemD> would have to accept either a value of 4 or 5.  Is
this possible?

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