What is wrong with the next Fluent NHibernate Mapping?

Question

I have 3 tables (from many to many)

• Resource {ResourceId, Description}
• Role {RoleId, Description}
• Resolution {ResourceId, RoleId}

I am trying to display over tables in run-nHibernate. This is what I am trying to do.

var aResource = session.Get<Resource>(1); // 2 Roles associated (Role 1 and 2)
var aRole = session.Get<Role>(1);
aResource.Remove(aRole); // I try to delete just 1 role from permission.

But sql generated here (this is wrong)

Delete from Permission where ResourceId = 1
Insert into Permission (ResourceId, RoleId) values (1, 2);

Instead of (correct)

    Delete from Permission where ResourceId = 1 and RoleId = 1

Why is nHibernate behaving like this? What is wrong with mapping? I even tried with Set instead of IList. Here is the complete code.

The objects

public class Resource
{
    public virtual string Description { get; set; }
    public virtual int ResourceId { get; set; }
    public virtual IList<Role> Roles { get; set; }

    public Resource()
    {
        Roles = new List<Role>();
    }
}

public class Role
{
    public virtual string Description { get; set; }
    public virtual int RoleId { get; set; }
    public virtual IList<Resource> Resources { get; set; }

    public Role()
    {
        Resources = new List<Resource>();
    }
}

Display here

// Mapping ..
public class ResourceMap : ClassMap<Resource>
{
    public ResourceMap()
    {
        Id(x => x.ResourceId);
        Map(x => x.Description);
        HasManyToMany(x => x.Roles).Table("Permission");
    }
}

public class RoleMap : ClassMap<Role>
{
    public RoleMap()
    {
        Id(x => x.RoleId);
        Map(x => x.Description);
        HasManyToMany(x => x.Resources).Table("Permission");
    }
}

Program

    static void Main(string[] args)
    {
        var factory = CreateSessionFactory();
        using (var session = factory.OpenSession())
        {
            using (var tran = session.BeginTransaction())
            {
                var aResource = session.Get<Resource>(1);
                var aRole = session.Get<Role>(1);
                aResource.Remove(aRole);
                session.Save(a);
                session.Flush(); 
                tran.Commit();
            }
        }
    }
    private static ISessionFactory CreateSessionFactory()
    {
        return Fluently.Configure()
            .Database(MsSqlConfiguration.MsSql2008
            .ConnectionString("server=(local);database=Store;Integrated Security=SSPI"))
            .Mappings(m => 
                m.FluentMappings.AddFromAssemblyOf<Program>()
                .Conventions.Add<CustomForeignKeyConvention>())
            .BuildSessionFactory();
    }

    public class CustomForeignKeyConvention : ForeignKeyConvention
    {
        protected override string GetKeyName(FluentNHibernate.Member property, Type type)
        {
            return property == null ? type.Name + "Id" : property.Name + "Id";
        }
    }

Thanks Ashraf.

Answer 1

nHibernate , , /. "". : "" "" , "" ( ). ManyToMany (HashSet/Set) "". HasMany. "AsSet" . (IList/ICollection) "". List, "AsList" . List .

// Mapping .. 
public class ResourceMap : ClassMap<Resource> 
{ 
    public ResourceMap() 
    { 
        Id(x => x.ResourceId); 
        Map(x => x.Description); 
        HasManyToMany(x => x.Roles).AsSet().Inverse().Table("Permission");
    } 
} 

public class RoleMap : ClassMap<Role> 
{ 
    public RoleMap() 
    { 
        Id(x => x.RoleId); 
        Map(x => x.Description); 
        HasManyToMany(x => x.Resources).AsSet().Cascade.SaveUpdate().Table("Permission");
    } 
} 

, Fetch.Select(). LazyLoad() lazyload.