异常 - ReferentialConstraint中的依赖属性映射到商店生成的列。列：'Id'

Question

好吧，这是情况..我遇到了一个奇怪的异常，并通过各种其他答案在这里stackoverflow我已经发现它必须有一些与我的项目之间的映射 - 实体和与图像实体的一对一关系。尽管如此，我仍然无法弄清楚错误的确切原因是什么。

我读过到目前为止这些问题的答案，但没有人帮我解决不幸的错误。我想这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

这是确切的错误我得到

我的整个模型是使用代码优先迁移创建的，最近我从数据注释更改为流畅的映射。我已经让MVC支架基于我的DTO创建了一个简单的索引，创建和编辑视图。我的想法是，我可以创建一个与至少一个“投资组合”和一个或多个图像相关的项目。

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; } 
} 

个ImageContent.cs

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

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

这是所使用的所有实体对象。我使用automapper将属性从DTO映射到实体对象。但是你可以假设所有DTO的属性与实体对象中的属性完全相同。

然后，使用以下在上下文中加载的类映射实体对象。

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(); 
    } 
} 

希望有人可以帮我解决这个问题。现在这让我疯狂！对于保存新项目的其他对象工作正常。但是，当通过接口创建一个新项目时，我所得到的是一个DbUpdateException，带有这个错误;

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

有人可以帮我解决这个问题吗？

Answer 1

终于解决了这个问题！我的一位同事给了我一个暗示，关于映射到正确的ID。所以我检查了project.cs的所有关系

一个项目属于一个项目，称为投资组合。这背后的想法是，你可以创建一个或多个项目组合。投资组合类的映射看起来像这样;

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解决了这个问题。