Entity Framework Code First Foreign Key Columnname inheritence - ef-code-first

Question

Entity Framework code first (v6) creates a columnname in the database that I don't like. In tablename SharepointMappings it adds columnname: 'SharepointDestination_DestinationId' (foreign key).
It also generates a columnname SharepointDestinationId.
I would like to have 1 column, a foreign key, with the name 'SharepointDestinationId'.
My model looks like this:
public class Destination
{
public int DestinationId { get; set; }
}
public class SharepointDestination : Destination
{
public string UserName { get; set; }
public string Password { get; set; }
public string Domain { get; set; }
public string SiteUrl { get; set; }
public string DocumentLibraryName { get; set; }
public List<SharepointMapping> Mappings { get; set; }
}
public class SharepointMapping
{
public int SharepointMappingId { get; set; }
public string SourceFieldName { get; set; }
public string DestinationFieldName { get; set; }
//[ForeignKey("SharepointDestination")]
public int SharepointDestinationId { get; set; }
//[ForeignKey("SharepointDestinationId")]
public virtual SharepointDestination SharepointDestination { get; set; }
}
//.....
protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
// To use TPT inheritence
modelBuilder.Entity<SharepointDestination>().ToTable("SharepointDestinations");
//modelBuilder.Entity<SharepointMapping>()
// .HasRequired(m => m.SharepointDestination)
// .WithMany(d => d.Mappings)
// .HasForeignKey(m => m.SharepointDestinationId)
// .WillCascadeOnDelete(true);
}
It doesn't matter if i leave or add the attribute ForeignKey and it also doesn't matter if i make properties virtual or not. Completely deleting both properties on SharepointMapping or giving them a complete other name has no consequences.
I think this has something to do with the inheritence structure. Because it's 'only' a 1-n mapping.
How should I configure EF to have only 1 column with the name 'SharepointDestinationId' which should be a foreign key? (and also have the navigation property and DestinationId property on the SharepointMapping class)

Answer 1

Since the key of SharepointDestination is DestinationId, EF can't automatically figure it out. You could go with the annotation:
[ForeignKey("DestinationId")]
public virtual SharepointDestination SharepointDestination { get; set; }
and remove this:
[ForeignKey("SharepointDestination")]
public int SharepointDestinationId { get; set; }
The fluent should work as well if you comment out the annotation:
modelBuilder.Entity<SharepointMapping>()
.HasRequired(m => m.SharepointDestination)
.WithMany(d => d.Mappings)
.HasForeignKey(m => m.DestinationId)
.WillCascadeOnDelete(true);

Answer 2

The ForeignKey attribute is expecting a property name, not a table column name.
Really, you should be able to do this without any attributes.
The following should work:
public class Parent
{
public int Id { get; set; }
public string Name { get; set; }
}
public class Child
{
public int Id { get; set; }
public string Name { get; set; }
public virtual Parent Parent { get; set; }
public int ParentId { get; set; }
}