异常 - ReferentialConstraint 中的从属属性映射到存储生成的列。列：'Id'

Question

好的，情况就是这样。我运行遇到了一个奇怪的异常，通过 Whosebug 上的各种其他答案，我发现它一定与两者之间的映射有关我的项目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。

到目前为止，我已经阅读了这些答案，但不幸的是，其中 none 帮助我解决了错误。我猜它一定是非常小而愚蠢的东西。

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

这正是我遇到的错误

我的整个模型是使用代码优先迁移创建的，我最近从数据注释更改为流畅的映射。我已经让 MVC 基于我的 DTO 构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 'Portfolio' 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; }
}

ImageContent.cs

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

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

这是使用的所有实体对象。我正在使用 automapper 将属性从 DTO 映射到实体对象。但是您可以假设所有 DTO 的属性与实体对象中的属性完全相同。

然后使用以下类映射实体对象，这些对象在上下文中加载。

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();
    }
}

希望有人能帮我解决这个问题。现在这让我发疯！对于其他对象，保存新项目效果很好。但是当通过界面创建一个新项目时，我得到的只是一个带有此错误的 DbUpdateException；

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

终于解决问题了！我的一位同事给了我一个关于映射到正确 ID 的提示。所以我检查了 project.cs

周围的所有关系

项目属于称为投资组合的项目。这背后的想法是您可以创建一个或多个包含项目的投资组合。投资组合 class 的映射如下所示；

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
    }
}

删除奇怪的 HasRequired 解决了问题。

异常 - ReferentialConstraint 中的从属属性映射到存储生成的列。列：'Id'

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

c#

entity-framework

ef-code-first

ef-fluent-api

异常 - ReferentialConstraint 中的从属 属性 映射到存储生成的列。列：'Id'

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

c#

entity-framework

ef-code-first

ef-fluent-api

异常 - ReferentialConstraint 中的从属属性映射到存储生成的列。列：'Id'