Question

我正在开发一个MVC / EF Code-First应用程序。作为最后一项功能，我添加了一个历史记录表INV_AssetsHistory，每当Insert/Update中的记录为INV_Assets时，该记录表都会有记录。我现在要弄清楚的是如何在我的视图中显示特定资产的每个INV_AssetsHistory记录 - 比如用户选择Edit/Delete的特定资产，我想要它们在INV_AssetsHistory上查看视图中此特定INV_Assets的每条记录。

有人能举例说明如何解决这个问题吗？根据我对MVC的经验，我认为我需要在两个表之间的某处添加一个外键属性，然后有一个ICollection<>属性来保存所有INV_AssetsHistory个记录，但是我不确定实现此功能的语法。

更新

我尝试了以下内容：

已添加到INV_Assets：

public virtual ICollection<INV_AssetsHistory> AssetHistoryRecords { get; set; }`

更改INV_AssetsHistory

public int AssetId { get; set; }

到

public virtual INV_Assets INV_Asset { get; set; }

创建了新的Migration，并运行了update-database。

这导致：

介绍FOREIGN KEY约束＆＃39; FK_dbo.INV_AssetsHistory_dbo.INV_Assets_INV_Asset_Id＆＃39;在桌子上＆＃39; INV_AssetsHistory＆＃39;可能会导致循环或多个级联路径。指定ON DELETE NO ACTION或ON UPDATE NO ACTION，或修改其他FOREIGN KEY约束。无法创建约束。查看以前的错误。

更新2：

INV_Assets ：

namespace InventoryTracker.Models
{
    [GridTable(PagingEnabled = true, PageSize = 30)]
    public class INV_Assets 
    {
        // Setting GridColumn Annotations allows you to use AutoGenerateColumns on view to auto create the Grid based on the model.

        public int Id { get; set; }

        public int Model_Id { get; set; }
        [ForeignKey("Model_Id")]
        public virtual INV_Models Model { get; set; }

        [Required]
        public int Manufacturer_Id { get; set; }
        [ForeignKey("Manufacturer_Id")]
        public virtual INV_Manufacturers Manufacturer { get; set; }

        [Required]
        public int Type_Id { get; set; }
        [ForeignKey("Type_Id")]
        public virtual INV_Types Type { get; set; }

        [Required]
        public int Location_Id { get; set; }
        [ForeignKey("Location_Id")]
        public virtual INV_Locations Location { get; set; }

        public int Vendor_Id { get; set; }
        [ForeignKey("Vendor_Id")]
        public virtual INV_Vendors Vendor { get; set; }

        [Required]
        public int Status_Id { get; set; }
        [ForeignKey("Status_Id")]
        public virtual INV_Statuses Status { get; set; }

        public string ip_address { get; set; }

        public string mac_address { get; set; }

        [DataType(DataType.MultilineText)]
        public string note { get; set; }
        public string owner { get; set; }

        //[DataType(DataType.Currency)]
        //[DisplayFormat(DataFormatString="{0:C}", ApplyFormatInEditMode=true)]
        [DisplayFormat(DataFormatString = "{0:#,###0.00}", ApplyFormatInEditMode=true)]
        public decimal cost { get; set; }
        public string po_number { get; set; }

        [DataType(DataType.MultilineText)]
        public string description { get; set; }

        public int invoice_number{ get; set; }

        [Required]
        public string serial_number { get; set; }

        [Required]
        public string asset_tag_number { get; set; }

        [DataType(DataType.Date)]
        [DisplayFormat(DataFormatString = "{0:yyyy-MM-dd}", ApplyFormatInEditMode = true)]
        public DateTime? acquired_date { get; set; }

        [DataType(DataType.Date)]
        [DisplayFormat(DataFormatString = "{0:yyyy-MM-dd}", ApplyFormatInEditMode = true)]
        public DateTime? disposed_date { get; set; }

        [DataType(DataType.Date)]
        [DisplayFormat(DataFormatString = "{0:yyyy-MM-dd}", ApplyFormatInEditMode = true)]
        public DateTime? verified_date { get; set; }

        [Required]
        [DataType(DataType.Date)]
        [DisplayFormat(DataFormatString = "{0:yyyy-MM-dd}", ApplyFormatInEditMode = true)]
        public DateTime created_date { get; set; }

        [Required]
        public string created_by { get; set; }

        [DisplayFormat(DataFormatString = "{0:yyyy-MM-dd}")]
        public DateTime? modified_date { get; set; }

        public string modified_by { get; set; }

        // Flag to specify if item is available? (Not signed out, not auctioned, recycled, etc.)
        //public bool available { get; set; }
    }
}

INV_AssetsHistory ：

namespace InventoryTracker.Models
{
    public class INV_AssetsHistory
    {
        public int Id { get; set; }

        [Required]
        public int AssetId { get; set; }

        //public int Model_Id { get; set; }
        //[ForeignKey("Model_Id")]
        public virtual INV_Models Model { get; set; }

        [Required]
        //public int Manufacturer_Id { get; set; }
        //[ForeignKey("Manufacturer_Id")]
        public virtual INV_Manufacturers Manufacturer { get; set; }

        [Required]
        //public int Type_Id { get; set; }
        //[ForeignKey("Type_Id")]
        public virtual INV_Types Type { get; set; }

        [Required]
        //public int Location_Id { get; set; }
        //[ForeignKey("Location_Id")]
        public virtual INV_Locations Location { get; set; }

        //public int Vendor_Id { get; set; }
        //[ForeignKey("Vendor_Id")]
        public virtual INV_Vendors Vendor { get; set; }

        [Required]
        //public int Status_Id { get; set; }
        //[ForeignKey("Status_Id")]
        public virtual INV_Statuses Status { get; set; }

        public string ip_address { get; set; }

        public string mac_address { get; set; }

        [DataType(DataType.MultilineText)]
        public string note { get; set; }
        public string owner { get; set; }

        //[DataType(DataType.Currency)]
        //[DisplayFormat(DataFormatString="{0:C}", ApplyFormatInEditMode=true)]
        [DisplayFormat(DataFormatString = "{0:#,###0.00}", ApplyFormatInEditMode = true)]
        public decimal cost { get; set; }
        public string po_number { get; set; }

        [DataType(DataType.MultilineText)]
        public string description { get; set; }

        public int invoice_number { get; set; }

        [Required]
        public string serial_number { get; set; }

        [Required]
        public string asset_tag_number { get; set; }

        [DataType(DataType.Date)]
        [DisplayFormat(DataFormatString = "{0:yyyy-MM-dd}", ApplyFormatInEditMode = true)]
        public DateTime? acquired_date { get; set; }

        [DataType(DataType.Date)]
        [DisplayFormat(DataFormatString = "{0:yyyy-MM-dd}", ApplyFormatInEditMode = true)]
        public DateTime? disposed_date { get; set; }

        [DataType(DataType.Date)]
        [DisplayFormat(DataFormatString = "{0:yyyy-MM-dd}", ApplyFormatInEditMode = true)]
        public DateTime? verified_date { get; set; }

        [Required]
        [DataType(DataType.Date)]
        [DisplayFormat(DataFormatString = "{0:yyyy-MM-dd}", ApplyFormatInEditMode = true)]
        public DateTime created_date { get; set; }

        [Required]
        public string created_by { get; set; }

        [DisplayFormat(DataFormatString = "{0:yyyy-MM-dd}")]
        public DateTime? modified_date { get; set; }

        public string modified_by { get; set; }
    }
}

Answer 1

假设资产记录在SQL中具有id，您可以创建一个方法，使用资产ID从历史记录表中检索资产历史记录。也许是这样的事情。

只需传入assetId作为参数。

在您的数据存储库中

public IQueryable<INV_AssetsHistory> GetHistoryByAssetId(int assetId)
{
  var records = _dataContext.INV_AssetsHistory.Where
   (
      x => x.AssetId == assetId
   );
   return records;
}

在您的控制器中

    [HttpGet]
    public ActionResult ViewAsset(int id = 0)
    {
        // Add Asset History to the View
        ViewBag.History = _repository.GetHistoryByAssetId(id)

        // Asset Details
        var asset = _assetRepository.GetAssetById(id);
        return View("AssetDetails", asset);
    }

在您的视图中

<tbody>
  @foreach (var action in ViewBag.History)
  {
    <tr>
       <td>@action.something</td>
    </tr>
  }
</tbody>

如果我误解了你的问题，请随时纠正我。

显示资产视图的所有历史记录？

1 个答案: