Fluent NHibernate enforce Not Nullable on Foreign Key Reference

Question

Just getting my feet wet with some Fluent NHibernate AutoMap conventions, and ran into something I couldn\'t figure out. I assume I\'m just not looking in the right place...

Answer 1

It seems that IPropertyConvention is only called on simple properties of your classes. If your property references another class, you need to use IReferenceConvention too.

Try this:

public class FluentConvention : IPropertyConvention, IReferenceConvention  
{      
    public void Apply(IPropertyInstance instance)
    {          
        instance.Not.Nullable();      
    }

    public void Apply(IManyToOneInstance instance)
    {
        instance.Not.Nullable();
    }
}      

Answer 2

You can override the auto-mapped properties as part of your AutoMap in Fluenttly.Configure().

So you can do this:

.Override<Job>(map => map.References(x => x.Group).Not.Nullable())

It's not exactly convenient if you have a lot of classes that need this though.

Edit: You can also specify the override in a class that implements IAutoMappingOverride like so:

    public class JobMappingOverride : IAutoMappingOverride<Job>
    {
            public void Override(AutoMapping<Job> mapping)
            {
                    mapping.References(x => x.Group).Not.Nullable();
            }
    }

and include it like so:

    .UseOverridesFromAssemblyOf<JobMappingOverride>()

This would keep your fluent configuration a little cleaner.