[英]ASP.NET MVC 5 Edit Action - How to write to Multiple DB Tables/Models
有沒有辦法以某種方式組合來自兩個模型的數據,然后在編輯操作的上下文中將它們都映射到同一viewModel?
我從來沒有在帶有實體框架6.1.3的ASP.NET MVC中的編輯操作中一次更新過幾個表。 這是布局:
我有一個名為“地址”的數據庫表,其中具有StreetNumber,StreetName,City,State,ZipCode的字段。 它與另一個稱為Bars的表具有一對一的關系。 如圖所示,一個條只能有一個地址,而一個地址只能有一個地址。
因為我將這些數據存儲在兩個單獨的表中,所以很難成功地執行Edit操作,該操作從一種表單 (BarForm)中獲取數據,並且應該同時更新Bar和Address數據庫表。 看我的代碼:
條形控制器
public ActionResult Edit(int id)
{
var bar = _context.Bars.SingleOrDefault(m => m.Id == id);
var address = _context.Addresses.SingleOrDefault(a => a.BarId == id);
//Make sure that the id actually exists:
if (bar == null)
{
return HttpNotFound();
}
var viewModel = Mapper.Map<Bar, BarFormViewModel>(bar, new BarFormViewModel());
if (address == null)
{
address = new Address();
}
Mapper.Map<Address, BarFormViewModel>(address, viewModel);
viewModel.IsNew = false;
return View("BarForm", viewModel);
}
[ValidateAntiForgeryToken]
public ActionResult Save(BarFormViewModel bar)
{
if (!ModelState.IsValid)
{
var viewModel = Mapper.Map<BarFormViewModel, BarFormViewModel>(bar, new BarFormViewModel());
viewModel.IsNew = false;
return View("BarForm", viewModel);
}
if (bar.Id == 0)
{
var newbar = Mapper.Map<BarFormViewModel, Bar>(bar);
newbar.LastUpdated = DateTime.UtcNow;
_context.Bars.Add(newbar);
var addressToAdd = Mapper.Map<BarFormViewModel, Address>(bar);
_context.Addresses.Add(addressToAdd);
}
else
{
var barInDb = _context.Bars.Single(b => b.Id == bar.Id);
var addressInDb = _context.Addresses.Single(a => a.BarId == bar.Id);
Mapper.Map<BarFormViewModel, Bar>(bar, barInDb);
Mapper.Map<BarFormViewModel, Address>(bar, addressInDb);
}
_context.SaveChanges();
return RedirectToAction("Index", "Bar");
}
領域模型:
public class Bar
{
public int Id { get; set; }
public string Name { get; set; }
[Required]
public string GooglePlaceId { get; set; }
public string SundayDiscounts { get; set; }
public string MondayDiscounts { get; set; }
public string TuesdayDiscounts { get; set; }
public string WednesdayDiscounts { get; set; }
public string ThursdayDiscounts { get; set; }
public string FridayDiscounts { get; set; }
public string SaturdayDiscounts { get; set; }
[Display(Name = "Last Updated")]
public DateTime LastUpdated { get; set; }
}
public class Address
{
public int Id { get; set; }
public int? Number { get; set; }
public string StreetName { get; set; }
public string City { get; set; }
public string State { get; set; }
[Required]
public int ZipCode { get; set; }
public Bar Bar { get; set; }
public int BarId { get; set; }
}
包含地址和欄屬性的視圖模型 :
{
public class BarFormViewModel
{
public int? Id { get; set; }
public string Name { get; set; }
[Required]
[Display(Name = "Google Place ID")]
public string GooglePlaceId { get; set; }
[Display(Name = "Sunday Happy Hour Info:")]
public string SundayDiscounts { get; set; }
[Display(Name = "Monday Happy Hour Info:")]
public string MondayDiscounts { get; set; }
[Display(Name = "Tuesday Happy Hour Info:")]
public string TuesdayDiscounts { get; set; }
[Display(Name = "Wednesday Happy Hour Info:")]
public string WednesdayDiscounts { get; set; }
[Display(Name = "Thursday Happy Hour Info:")]
public string ThursdayDiscounts { get; set; }
[Display(Name = "Friday Happy Hour Info:")]
public string FridayDiscounts { get; set; }
[Display(Name = "Saturday Happy Hour Info:")]
public string SaturdayDiscounts { get; set; }
[Display(Name = "Last Updated")]
public DateTime? LastUpdated { get; set; }
//Address Model Info
public Address Address { get; set; }
public int? AddressId { get; set; }
[RegularExpression("([1-9][0-9]*)", ErrorMessage = "Must be a number")]
public int? Number { get; set; }
public string StreetName { get; set; }
public string City { get; set; }
public string State { get; set; }
[Required]
public int? ZipCode { get; set; }
public bool IsNew { get; set; }
}
這里的問題是,使用此設置時,我得到一個空的AddressId,這在運行Save操作時導致異常。 這是因為BarForm視圖正在傳遞從Bar對象映射的ViewModel,並且Bar域模型中實際上沒有Address信息,因為它不是Address模型/表。
有沒有辦法以某種方式從兩個地址和酒吧結合模型中的數據,然后將它們都映射到相同的視圖模型?
在“保存”操作中,此行不斷出現“序列不包含任何元素”錯誤:
var addressInDb = _context.Addresses.Single(a => a.Id == bar.AddressId);
我也嘗試過:
var addressInDb = _context.Addresses.Single(a => a.BarId == bar.Id);
都不起作用。 我了解錯誤在說什么,並且還檢查了我隱藏的Addressid字段的實際HTML,它為空白...請參見BarForm視圖中的代碼:
@Html.HiddenFor(m => m.Id)
@Html.HiddenFor(m => m.AddressId)
@Html.AntiForgeryToken()
刪除new BarFormViewModel()
作為映射調用中的第二個參數,這是不必要的。
在您的發布操作中,在if語句中,該語句檢查ModelState是否有效以及bar.Id == 0,bar已經是視圖模型,因此無需映射。
並且,當您創建AutoMapper映射時,必須創建一個自定義屬性映射,因為Address.Id屬性不會自動映射到AddressId屬性,因為名稱不同。
AutoMapper.Mapper.CreateMap<Address, BarFormViewModel>()
.ForMember(dest => dest.AddressId, o => o.MapFrom(source => source.Id));
然后對逆映射執行相同的操作。
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