Automapping and Fluent NHibernate

2
votes

I copied example from Fluent NHibernate GitHub documentation for automapping and it doesn't work in my ASP.NET MVC 4 app.

public class Product
{
  public virtual int Id { get; set; }
  public virtual string Name { get; set; }
  public virtual decimal Price { get; set; }
}

public class Shelf
{
  public virtual int Id { get;  set; }
  public virtual IList<Product> Products { get; set; }

  public Shelf()
  {
    Products = new List<Product>();
  }
}

Are models. When I add 

.Mappings(m => m.AutoMappings
     .Add(AutoMap.AssemblyOf<Product>()))

to my configuration I get error No parameterless constructor defined for this object.. Without that, my session works fine and also with mapping defined by me one by one, everything works. Just automapping doesn't work. What's the problem?

1
c#nhibernatefluent-nhibernate

1 Answers

1
votes

The issue is that in the Assembly containing the Product, could be some object/entity, with such a "missing parameterless constructor" (some helper object). You have to be more specific, try to use the .Where() to narrow the set of auto-mapped objects/entities

.Mappings(m =>
    m.AutoMappings
     .Add(AutoMap.AssemblyOf<Product>()
                 .Where(t => t.Namespace ==...

...or something like that. Just be precise what should be auto-mapped.