Edited Issue: Error 3032 IDBSet.Find(id) when using inheritance [463]

All,

When using Entity Framework 5 Code First, with Table Per Hierarchy. This combined with an Repository and Unit of Work (tried several implementations). I'm having the following error:

(34,10) : error 3032: Problem in mapping fragments starting at lines 19, 34:EntityTypes T, T are being mapped to the same rows in table T. Mapping conditions can be used to distinguish the rows that these types are mapped to.

I have resolved this issue using the following guide: Entity Framework 4.3 - TPH mapping and migration error

This works when using a general look-up of all records, then no errors.

When using the DBSet.Find(id), I receive the above error message.

When using DBSet.Where(t => t.id == id) all works fine.

Please does anyone have the solution for this problem?

Kind regards,
Pieter Jong

Sample code:

public class TDataContext : DbContext
{
// Models
public abstract class BaseTrackable
{
public DateTime DateModified { get; set; }
}

public abstract class ParentClass : BaseTrackable
{
public int ParentId { get; set; }
public string ParentString { get; set; }
}

public class Foo : ParentClass
{
public string FooString { get; set; }
}

public class Bar : ParentClass
{
public string BarString { get; set; }
}

// Configuration
public class ParentConfiguration : EntityTypeConfiguration<ParentClass>
{
public ParentConfiguration()
{
ToTable("Parent");
}
}

public class FooConfiguration : EntityTypeConfiguration<Foo>
{
public FooConfiguration()
{
Map(m => m.Requires("FooIndicator").HasValue(true));
}
}

public class BarConfiguration : EntityTypeConfiguration<Bar>
{
public BarConfiguration()
{
Map(m => m.Requires("BarIndicator").HasValue(true));
}
}

public DbSet<ParentClass> Parent { get; set; }

protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
modelBuilder.Configurations
.Add(new ParentConfiguration())
.Add(new FooConfiguration())
.Add(new BarConfiguration());
}

}

public class Controller
{
TDataContext _context = new TDataContext();

// Repository function
public T GetById<T>(object id) where T : class
{
var dbset = _context.Set<T>();
return dbset.Find(id);
}

public IQueryable<TDataContext.Foo> GetFiltered(Expression<Func<TDataContext.Foo, bool>> filter)
{
var dbset = _context.Set<TDataContext.Foo>();
return dbset.Where(filter);
}

// Final call
// Which fails..
public TDataContext.Foo Get(int id)
{
return this.GetById<TDataContext.Foo>(id);
}

// This works...
public TDataContext.Foo GetWhere(int id)
{
return this.GetFiltered(f => f.ParentId == id).FirstOrDefault();
}
}