Question

Is there a way in Fluent NHibernate to specify that a foreign key should be indexed?

MS Sql Server’s default configuration does not index foreign keys. I would like the schema generated by the NHibernate schema generation/update tools to index these keys. When I just use the HasMany or HasManyToMany methods, no such indexes are created. Is this even possible with raw XML mappings?

Answer 1

I think the ‘index’ attribute on a column mapping element is what you are after. If you’re on the latest version of FNH, you can set this for a one-to-many like so:

HasMany(x => x.Components)
       .KeyColumns.Add("ProductId", c => c.Index("someIndex");

The same API is not yet available for many-to-many’s, but it is on its way.