Nhibernate ManyToMany with a dynamic where clause - nhibernate

Question

I'm having some issues mapping a complex many to many relationship in fluentnhibernate. I have a legacy db which looks something like this:
Foos: | Id | Foo |
FooBars: | FooId | BarId |
Bars: | Id | Bar | CultureId |
which I am trying to map to the following object model:
class Foo
{
property virtual int Id { get; set; }
property virtual string Foo { get; set; }
property virtual IList<Bar> Bars { get; set; }
}
class Bar
{
property virtual int Id { get; set; }
property virtual int CultureId { get; set; }
}
with the mappings:
public class FooMapping : ClassMap<Foo>
{
public FooMapping()
{
Table("foos");
Id(v => v.Id);
Map(v => v.Foo);
HasManyToMany(v => v.Bars)
.Table("FooBars")
.ParentKeyColumn("FooId")
.ChildKeyColumn("BarId")
.Cascade.All();
}
}
public class BarMapping : ClassMap<Bar>
{
public BarMapping()
{
Table("bars");
Id(v => v.Id);
Map(v => v.Bar);
Map(v => v.CultureId);
}
}
The problem is I have multiple Bar's with the same Id for different CultureIds
e.g.
I would have a table that looks like:
Id|Bar|CultureId
1, Hello, 1
1, Bonjour, 2
1, Gutentag, 3
At the moment, the Bars property for the above table will return 3 elements but the Bar property on it will return "Hello" for all three elements (presumably because they all have the same identity). So my question is, how can I either stop this happening or can anyone suggest a way of filtering rows that do not have the correct culture id (note, this is dynamic & based on the current culture)?

Answer 1

You can't create dynamic where clauses in your mappings. You're going to need to query this collection instead of accessing it via the parent, using a Criteria or HQL query. You could read up on filters, but they still require a query.