Using AutoMapper in the Edit action method in an MVC3 application
asp.net-mvc-3, automapper, c#
Solution
I think you just do
Product product = _productRepository.FindProduct(model.ProductId);
Mapper.Map(model, product);
_productRepository.SaveChanges();
you may also want to check that you have a non null product first, and also that user is allowed to change that product....
Problem
Here is my controller code, which works 100% as I need it to. However the POST method isn't using the AutoMapper and that is not OK. How can I use AutoMapper in this action method? I'm using Entity Framework 4 with the Repository Pattern to access data. ``` public ActionResult Edit(int id) { Product product = _productRepository.FindProduct(id); var model = Mapper.Map<Product, ProductModel>(product); return View(model); } [HttpPost] public ActionResult Edit(ProductModel model) { if (ModelState.IsValid) { Product product = _productRepository.FindProduct(model.ProductId); product.Name = model.Name; product.Description = model.Description; product.UnitPrice = model.UnitPrice; _productRepository.SaveChanges(); return RedirectToAction("Index"); } return View(model); } ``` If I use AutoMapper, the entity framework reference is lost and the data doesn't persist to the database. ``` [HttpPost] public ActionResult Edit(ProductModel model) { if (ModelState.IsValid) { Product product = _productRepository.FindProduct(model.ProductId); product = Mapper.Map<ProductModel, Product>(model); _productRepository.SaveChanges(); return RedirectToAction("Index"); } return View(model); } ``` I'm guessing this is caused the Mapper.Map function returning a brand new Product object and because of that, no references to the entity framework graph is being kept. What alternatives do you suggest?