i don't think you can map it that way. you need a base class/interface
that Foo and Bar inherit from.
[ActiveRecord("Fu", DiscriminatorColumn="type",
DiscriminatorType="string")]
abstract class Fu
{
public abstract bool IsValid();
}
[ActiveRecord("Fu", DiscriminatorColumn="type",
DiscriminatorType="string", DiscriminatorValue="Foo")]
class Foo : Fu
{
public override bool IsValid() { }
}
[ActiveRecord("Fu", DiscriminatorColumn="type",
DiscriminatorType="string", DiscriminatorValue="Bar")]
class Bar : Fu
{
public override bool IsValid() { }
}
which would change your query to
SimpleQuery q = new SimpleQuery("from Fu where whatever");
var results = q.Execute();
foreach (Fu result in results)
{
System.out.WriteLine(result.IsValid())
}
as it stands now NH will always return implementations of Foo and not
Bar because Bar implements Foo, you are querying for all Foos and Foo
is a concrete type.
BTW: I'm not 100% on the AR mappings. I use NH mappings directly.
On Dec 10, 2:07 pm, Chris Curvey <[email protected]> wrote:
> I'm sure that I'm missing something basic, but I'm not sure if it's a
> C# thing that I'm missing, or an HQL thing that I'm missing, or an AR
> thing that I'm missing. I hope someone can help.
>
> I have two classes in a single-table inheritance relationship
>
> [ActiveRecord("MyTable", DiscriminatorColumn="type",
> DiscriminatorType="string", DiscriminatorValue="Foo")]
> public class Foo : ActiveRecordBase<Foo>
> {
> public bool IsValid() { ...do some stuff ...}
>
> }
>
> [ActiveRecord(DiscriminatorValue="Bar")]
> public class Bar : Foo
> {
> public bool IsValid() { ... do some stuff ... }
>
> }
>
> So what I want to do is roll through a list of instances, and call
> IsValid() on each of them, taking advantage of polymorphism. So I
> have this:
>
> SimpleQuery q = new SimpleQuery("from Foo where whatever ");
> Foo[] fooArray = q.Execute();
> foreach (Foo foo in fooArray)
> {
> System.out.WriteLine(foo.IsValid())
>
> }
>
> But it always seems to call "Foo.IsValid()" and never calls
> "Bar.IsValid()". Which kind of makes sense, as the "foo" variable
> has been declared as an instance of "Foo", but how do I set it up so
> that "foo.IsValid" calls the appropriate routine? I've tried
> upcasting and downcasting, but I can't get it straight.
>
> So, what am I missing?
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