public ProductModel Update(ProductModel updatedProductModel)
 {
     _ctx.ProductModels.Attach(updatedProductModel).State = EntityState.Modified;
     _ctx.Entry(updatedProductModel).Reference(pm => pm.ProductCategory).IsModified = true;
     _ctx.SaveChanges();
     return(updatedProductModel);
 }
 public Order Update(Order updatedOrder)
 {
     _ctx.Orders.Attach(updatedOrder).State = EntityState.Modified;
     _ctx.Entry(updatedOrder).Reference(o => o.Country).IsModified = true;
     _ctx.SaveChanges();
     return(updatedOrder);
 }