You don't normally have the discriminator as an actual property in your
entity too, it's usually just a column. That's not to say it's incorrect,
just something I've not seen before. Perhaps try it without.
On Fri, Mar 6, 2009 at 2:21 AM, Roger Heim <roger.h...@gmail.com> wrote:
>
> Hi All,
>
> I've just started using FNH and NHibernate. Between FNH and Steve
> Bohlen's Summer of NHibernate videos I think I'm starting to get my
> brain wrapped around this stuff but I have a question about using
> discriminators and sub-classes.
>
> I have an entity that implements a General Ledger account. The account
> can be one of 5 types: Asset, Liability, Equity, Income or Expense and
> is represented by an Int32 that has the value 1-5. I created a
> GLAccount class that contains all the properties. The class looks like
> this:
> public class GLAccount
> {
> public virtual Guid AccountID { get; private set;}
> public virtual decimal AccountNumber {get; set;}
> public virtual string Description {get;set;}
> public virtual int AccountType {get;set;}
> public virtual int Version {get; private set;}
> }
>
> I also created five classes for the different account types:
> GLAssetAccount, GLLiabilityAccount, GLEquityAccount, GLIncomeAccount
> and GLExpenseAccount. They are all subclasses of GLAccount but they
> have no additional properties. Here's the discriminator portion of the
> mapping class:
> DiscriminatorSubClassesOnColumn<int>("AccountType"), -1)
> .SubClass<GLAssetAccount>(1), m=>m.Map
> (x=>x.AccountType).Not.Nullable())
> .SubClass<GLLiabilityAccount>(2), m=>m.Map
> (x=>x.AccountType).Not.Nullable())
> .SubClass<GLEquityAccount>(3), m=>m.Map
> (x=>x.AccountType).Not.Nullable())
> .SubClass<GLIncomeAccount>(4), m=>m.Map
> (x=>x.AccountType).Not.Nullable())
> .SubClass<GLExpenseAccount>(5), m=>m.Map
> (x=>x.AccountType).Not.Nullable());
>
> In my unit test I try to add an instance of the GLAccount object and
> it passes but it assigns -1 as the AccountType even if I specifically
> set it; I assume that's because of the -1 in the
> DiscriminatorSubClassesOnColumn line. But if I try to add an instance
> of a GLAssetAccount object it fails and throws an
> IndexOutOfRangeException: Invalid index 4 for this
> SqlParameterCollection with Count=4 and I never get to see the
> generated SQL.
>
> Based on my objects is using Table-Per-Class-Hierarchy correct? Can
> anyone tell me what I've done wrong?
>
> Roger Heim
>
>
> >
>
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