Breeze EF SaveChanges() on a DTO - entity-framework

Question

I've been struggling with Breeze to SaveChanges to a projection and admit I new to both EF and breeze. There were some similar questions earlier when I was trying to use WCF, but now I have abandoned WCF and added EF directly to my solution.
In my controller I return the DTO for the metadata to breeze along with the DTO and it binds perfectly.
After altering the data on the client my Breese Controllers [HttpPost] SaveChanges(save Bundle) is called and map contains the DTO and the changes.
How Do I persist the Changes? If I re-read the DTO projection for breeze to update then EF cant save a projection because it's not "tracked", if I read the Full entity, then Breeze error with "Sequence contains no matching element" because its looking for the DTO? Am I suppose to use AutoMapper?
Controller:
[BreezeController]
public class BreezeController : ApiController
{
readonly EFContextProvider<ManiDbContext> _contextProvider = new EFContextProvider<ManiDbContext>();
[HttpGet]
public string Metadata()
{
return _contextProvider.Metadata();
}
[HttpGet]
public IQueryable<ConsigneDTO> Consignee(string refname)
{
return _contextProvider.Context.consigneDTO(refname);
}
[HttpPost]
public SaveResult SaveChanges(JObject saveBundle)
{
ManiDbContextProvider _mcontextProvider = new ManiDbContextProvider();
return _mcontextProvider.SaveChanges(saveBundle);
}
ManiDbContext (the main DBContext is CifContext which is Database First/EF Reverse Engineer)
public class ManiDbContext : DbContext
{
public CifContext CifDbContext = new CifContext();
protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
modelBuilder.Conventions.Remove<PluralizingTableNameConvention>();
Database.SetInitializer<ManiDbContext>(null);
modelBuilder.Configurations.Add(new ConsigneDTOMap());
}
public override int SaveChanges()
{
CifDbContext.SaveChanges();
return 1;
}
public IQueryable<ConsigneDTO> consigneDTO(string refname)
{
IQueryable<ConsigneDTO> q = this.CifDbContext.Consignes
.Where(x => x.Refname == refname)
.Select(f => new ConsigneDTO {Refname = f.Refname, Consignee = f.Consignee, Address1 = f.Address1, Address2 = f.Address2, Address3 = f.Address3});
return q;
}
ManiDbContextProvider
public class ManiDbContextProvider : EFContextProvider<CifContext>
// public class ManiDbContextProvider : EFContextProvider<ManiDbContext>
{
public ManiDbContextProvider() : base() { }
protected override void OpenDbConnection()
{// do nothing
}
protected override void CloseDbConnection()
{ // do nothing
}
protected override bool BeforeSaveEntity(EntityInfo entityInfo)
{
var entity = entityInfo.Entity;
if (entity is ConsigneDTO)
{
return BeforeSaveConsignee(entity as ConsigneDTO, entityInfo);
}
throw new InvalidOperationException("Cannot save entity of unknown type");
}
private bool BeforeSaveConsignee(ConsigneDTO c, EntityInfo info)
{
var consdata = this.Context.CifDbContext.Consignes
.Where(x => x.Refname == c.Refname)
.FirstOrDefault(); // ENTITY
// var consdata = this.Context.consigneDTO(c.Refname); // DTO
return (null != consdata) || throwCannotFindConsignee();
}
CifContext (Full Columns - First/EF Reverse Engineer/ Consigne class contains Keys)
public partial class CifContext : DbContext
{
static CifContext()
{
Database.SetInitializer<CifContext>(null);
}
public CifContext()
: base("Name=CifContext")
{
}
public DbSet<Consigne> Consignes { get; set; }
protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
modelBuilder.Conventions.Remove<PluralizingTableNameConvention>(); // Use singular table names
Database.SetInitializer<CifContext>(null);
modelBuilder.Configurations.Add(new ConsigneMap());
}
Regardless if I Read the Entity or the DTO - I'm Clueless on how breeze updates EF
Any Help greatly appreciated :)
Regards,
Mike