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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