異常 - ReferentialConstraint中的依賴屬性映射到商店生成的列。列：'Id'

Question

好吧，這是情況..我遇到了一個奇怪的異常，並通過各種其他答案在這裏stackoverflow我已經發現它必須有一些與我的項目之間的映射 - 實體和與圖像實體的一對一關係。儘管如此，我仍然無法弄清楚錯誤的確切原因是什麼。

我讀過到目前爲止這些問題的答案，但沒有人幫我解決不幸的錯誤。我想這一定是一些非常小的和愚蠢。。

• A dependent property in a ReferentialConstraint is mapped to a store-generated column - when saving object
• A dependent property in a ReferentialConstraint is mapped to a store-generated column. Column:
• A dependent property in a ReferentialConstraint is mapped to a store-generated column error on 1-to-1 relationship

這是確切的錯誤我得到

我的整個模型是使用代碼優先遷移創建的，最近我從數據註釋更改爲流暢的映射。我已經讓MVC支架基於我的DTO創建了一個簡單的索引，創建和編輯視圖。我的想法是，我可以創建一個與至少一個「投資組合」和一個或多個圖像相關的項目。

Project.cs

public class Project : BaseEntity 
{ 
    public DateTime StartDate { get; set; } 

    public DateTime? EndDate { get; set; } 

    public String Title { get; set; } 

    public String ShortDescription { get; set; } 

    public String Description { get; set; } 

    public Guid? LargeImageId { get; set; } 
    public Image LargeImage { get; set; } 

    public Guid? MediumImageId { get; set; } 
    public Image MediumImage { get; set; } 

    public Guid SmallImageId { get; set; } 
    public Image SmallImage { get; set; } 

    public Guid PortfolioId { get; set; } 
    public virtual Portfolio Portfolio { get; set; } 
} 

Portfolio.cs

public class Portfolio : BaseEntity 
{ 
    public String Name { get; set; } 

    public virtual List<Project> Projects { get; set; } 
} 

Image.cs

public class Image : BaseEntity 
{ 
    public Int32 Width { get; set; } 
    public Int32 Height { get; set; } 
    public String Title { get; set; } 
    public String MimeType { get; set; } 
    public String Extension { get; set; } 
    public String Filename { get; set; } 

    public Guid FileContentId { get; set; } 
    public virtual ImageContent FileContent { get; set; } 
} 

個ImageContent.cs

public class ImageContent 
{ 
    //[DatabaseGenerated(DatabaseGeneratedOption.Identity)] 
    public Guid Id { get; set; } 

    public byte[] Content { get; set; } 
} 

這是所使用的所有實體對象。我使用automapper將屬性從DTO映射到實體對象。但是你可以假設所有DTO的屬性與實體對象中的屬性完全相同。

然後，使用以下在上下文中加載的類映射實體對象。

ProjectMap.cs

public class ProjectMap : BaseEntityTypeConfiguration<Project> 
{ 
    public ProjectMap() 
    { 
     //Primary key 
     HasKey(t => t.Id); 

     //Map schema name and table 
     ToTable("Project", SchemaConstants.Component); 

     //Set property mapping explicit if needed 
     Property(t => t.StartDate).IsRequired(); 
     Property(t => t.EndDate).IsOptional(); 
     Property(t => t.Title).HasMaxLength(150).IsRequired(); 
     Property(t => t.ShortDescription).HasMaxLength(200).IsOptional(); 
     Property(t => t.Description).IsRequired().HasColumnType("nvarchar(max)"); 

     //Foreign key relationships 
     HasRequired(t => t.SmallImage).WithMany().HasForeignKey(t => t.SmallImageId).WillCascadeOnDelete(true); 
     HasOptional(t => t.MediumImage).WithMany().HasForeignKey(t => t.MediumImageId).WillCascadeOnDelete(false); 
     HasOptional(t => t.LargeImage).WithMany().HasForeignKey(t => t.LargeImageId).WillCascadeOnDelete(false); 
     HasRequired(t => t.Portfolio).WithMany().HasForeignKey(t => t.PortfolioId).WillCascadeOnDelete(false); 

     //Other constraints 
    } 
} 

PortfolioMap.cs

public class PortfolioMap : BaseEntityTypeConfiguration<Portfolio> 
{ 
    public PortfolioMap() 
    { 
     //Primary key 
     HasKey(t => t.Id); 

     //Map schema name and table 
     ToTable("Portfolio", SchemaConstants.Component); 

     //Set property mapping explicit if needed 
     Property(t => t.Name).HasMaxLength(150).IsRequired(); 

     //Foreign key relationships 
     HasRequired(t => t.Projects).WithRequiredPrincipal(); 

     //Other constraints 
    } 
} 

ImageMap.cs

public class ImageMap : BaseEntityTypeConfiguration<Image> 
{ 
    public ImageMap() 
    { 
     //Primary key 
     HasKey(t => t.Id); 

     //Map schema name and table 
     ToTable("Image", SchemaConstants.Systeem); 

     //Set property mapping explicit if needed 
     Property(t => t.Width).IsRequired(); 
     Property(t => t.Height).IsRequired(); 
     Property(t => t.Title).HasMaxLength(150).IsRequired(); 
     Property(t => t.MimeType).HasMaxLength(150).IsRequired(); 
     Property(t => t.Extension).HasMaxLength(15).IsRequired(); 
     Property(t => t.Filename).HasMaxLength(255).IsRequired(); 

     //Foreign key relationships 
     HasRequired(t => t.FileContent).WithMany().HasForeignKey(t => t.FileContentId).WillCascadeOnDelete(true); 

     //Other constraints 
    } 
} 

ImageContentMap。CS

public class ImageContentMap : EntityTypeConfiguration<ImageContent> 
{ 
    public ImageContentMap() 
    { 
     //Primary key 
     HasKey(t => t.Id); 

     //Map schema name and table 
     ToTable("ImageContent", SchemaConstants.Systeem); 

     //Set property mapping explicit if needed 
     Property(t => t.Content).IsRequired(); 

     //Foreign key relationships 

     //Other constraints 
    } 
} 

BaseEntityTypeConfiguration.cs

public class BaseEntityTypeConfiguration<T> : EntityTypeConfiguration<T> where T : BaseEntity 
{ 
    public BaseEntityTypeConfiguration() 
    { 
     Property(t => t.TimeStamp).IsRowVersion().IsConcurrencyToken(); 
     Property(t => t.Id).HasDatabaseGeneratedOption(DatabaseGeneratedOption.Identity); 
     Property(t => t.PublishStart).IsRequired(); 
     Property(t => t.PublishEnd).IsOptional(); 
     Property(t => t.DateCreated).IsRequired(); 
     Property(t => t.DateDeleted).IsOptional(); 
     Property(t => t.IsPublished).IsRequired(); 
     Property(t => t.IsDeleted).IsRequired(); 

     Property(t => t.SystemName).HasMaxLength(150).IsRequired(); 
    } 
} 

希望有人可以幫我解決這個問題。現在這讓我瘋狂！對於保存新項目的其他對象工作正常。但是，當通過接口創建一個新項目時，我所得到的是一個DbUpdateException，帶有這個錯誤;

A dependent property in a ReferentialConstraint is mapped to a store-generated column. Column: 'Id' 

有人可以幫我解決這個問題嗎？

Answer 1

終於解決了這個問題！我的一位同事給了我一個暗示，關於映射到正確的ID。所以我檢查了project.cs的所有關係

一個項目屬於一個項目，稱爲投資組合。這背後的想法是，你可以創建一個或多個項目組合。投資組合類的映射看起來像這樣;

public class PortfolioMap : BaseEntityTypeConfiguration<Portfolio> 
{ 
    public PortfolioMap() 
    { 
     //Primary key 
     HasKey(t => t.Id); 

     //Map schema name and table 
     ToTable("Portfolio", SchemaConstants.Component); 

     //Set property mapping explicit if needed 
     Property(t => t.Name).HasMaxLength(150).IsRequired(); 

     //Foreign key relationships 
     HasRequired(t => t.Projects).WithRequiredPrincipal(); <<--- Line causing the error 

     //Other constraints 
    } 
} 

去除奇怪的HasRequired解決了這個問題。