c# - EF 6 关系 : One or more validation errors were detected during model generation

Question

我一直在绞尽脑汁想找出我认为相对简单的关系映射(一对多)。

让我们回顾一下模型中的内容:

ContentExternalLink

public class ContentExternalLink
{
    public ContentExternalLink()
    {
        ContentTagAssignments = new List<ContentTagAssignment>();
    }

    [Key]
    public string LinkId { get; set; }
    public string LinkTypeId { get; set; }
    public string LinkTitle { get; set; }
    public string LinkUrl { get; set; }
    public string LinkSource { get; set; }
    public string LinkPhoneNumber { get; set; }
    public DateTime LinkDate { get; set; }
    public DateTime LinkCreatedDate { get; set; }
    public DateTime LinkModifiedDate { get; set; }
    [ScriptIgnore]
    public virtual ICollection<ContentTagAssignment> ContentTagAssignments { get; set; }
}

ContentTagAssignmnent

public class ContentTagAssignment
{
    public ContentTagAssignment()
    {
        this.ContentExternalLink = new ContentExternalLink();
    }

    [Key]
    public string TagId { get; set; }
    [Key]
    public string ArticleId { get; set; }
    public bool IsPrimary { get; set; }
    public DateTime CreatedDate { get; set; }
    [ScriptIgnore]
    public virtual ContentExternalLink ContentExternalLink { get; set; }
}

现在进入映射:

ContentExternalLinkMap

public class ContentExternalLinkMap : EntityTypeConfiguration<ContentExternalLink>
{
    public ContentExternalLinkMap()
    {
        this.ToTable("content_external_link", "dbo");

        this.HasKey(c => c.LinkId);

        this.Property(c => c.LinkId).HasColumnName("link_id");
        this.Property(c => c.LinkTypeId).HasColumnName("link_type_id");
        this.Property(c => c.LinkTitle).HasColumnName("link_title");
        this.Property(c => c.LinkUrl).HasColumnName("link_url");
        this.Property(c => c.LinkSource).HasColumnName("link_source");
        this.Property(c => c.LinkPhoneNumber).HasColumnName("link_phone_number");
        this.Property(c => c.LinkDate).HasColumnName("link_date");
        this.Property(c => c.LinkCreatedDate).HasColumnName("link_created_date");
        this.Property(c => c.LinkModifiedDate).HasColumnName("link_modified_date");
    }
}

ContentTagAssignmnetMap

public class ContentTagAssignmentMap : EntityTypeConfiguration<ContentTagAssignment>
{
    public ContentTagAssignmentMap()
    {
        this.ToTable("content_tag_assignment", "dbo");

        this.HasKey(t => new {t.TagId, t.ArticleId});

        this.Property(t => t.TagId).HasColumnName("tag_id");
        this.Property(t => t.ArticleId).HasColumnName("article_id");
        this.Property(t => t.IsPrimary).HasColumnName("is_primary_tag");
        this.Property(t => t.CreatedDate).HasColumnName("created_date");


        this.HasOptional(t => t.ContentExternalLink)
            .WithMany(t => t.ContentTagAssignments)
            .HasForeignKey(t => new {t.TagId, t.ArticleId});
    }
}

这种关系肯定很奇怪，因为 LinkId 会与 ContentTagAssignment 中的 ArticleId 匹配。

我在 ContentTagAssignmentMap 中尝试了以下方法:

    //this.HasOptional(t => t.ContentExternalLink)
//    .WithMany(t => t.ContentTagAssignments)
//    .HasForeignKey(t => t.ContentExternalLink);

this.HasOptional(x => x.ContentExternalLink)
    .WithMany(x=>x.ContentTagAssignments)
    .Map(x => x.MapKey("LinkId").HasColumnAnnotation("LinkId","ArticleId",null));

//this.Map(m =>
//    {
//        m.Properties(x => x.ArticleId);
//        m.ToTable("content_tag_assignment");
//    })
//    .Map(p =>
//    {
//        p.Properties(x => x.ContentExternalLink.LinkId);
//        p.ToTable("ContentExternalLink");
//    });

评论的关系不起作用。一个有效的(因为它不会在初始页面加载时失败)。但是，当我尝试从 ContentExternalLink 访问 List 时，出现以下错误:{"Invalid column name 'LinkId'.\r\nInvalid column name 'LinkId'."

所以我更迷茫了...

问题

基本上，并不是每个 ContentExternalLink 都会有一个标签分配给它。但是，如果 ContentExternalLink 有 ContentTagAssignments，我应该能够得到它们的列表。此外，TagId 和 ArticleId 是字符串(guid)。

有人有什么建议吗？

谢谢!

Answer 1

在来自 ivan stoev 的评论之后，我看到这里唯一的错误是当外键也是主键时设置可选(不可为空)

所以映射将是:

public class ContentTagAssignmentMap : EntityTypeConfiguration<ContentTagAssignment>
{
    public ContentTagAssignmentMap()
    {
        this.ToTable("content_tag_assignment", "dbo");

        this.HasKey(t => new { t.TagId, t.ArticleId });

        this.Property(t => t.TagId).HasColumnName("tag_id");
        this.Property(t => t.ArticleId).HasColumnName("article_id");
        this.Property(t => t.IsPrimary).HasColumnName("is_primary_tag");
        this.Property(t => t.CreatedDate).HasColumnName("created_date");


        this.HasRequired(t => t.ContentExternalLink)
            .WithMany(t => t.ContentTagAssignments)
            .HasForeignKey(t => t.ArticleId)
            .WillCascadeOnDelete(false);
    }
}

以下是您的模型的工作示例:

class Program
{
    static void Main(string[] args)
    {
        var ctx = new Context();
        ctx.Database.Delete();
        ctx.Database.CreateIfNotExists();

        Console.ReadKey();
    }
}

public class Context : DbContext
{
    public Context():base ("Teste")
    {

    }

    public DbSet<ContentExternalLink> ContentExternalLinks { get; set; }
    public DbSet<ContentTagAssignment> ContentTagAssignments { get; set; }

    protected override void OnModelCreating(DbModelBuilder modelBuilder)
    {
        modelBuilder.Configurations.Add(new ContentExternalLinkMap());
        modelBuilder.Configurations.Add(new ContentTagAssignmentMap());

        base.OnModelCreating(modelBuilder);
    }

}

public class ContentExternalLink
{
    public ContentExternalLink()
    {
        ContentTagAssignments = new List<ContentTagAssignment>();
    }

    [Key]
    public string LinkId { get; set; }
    public string LinkTypeId { get; set; }
    public string LinkTitle { get; set; }
    public string LinkUrl { get; set; }
    public string LinkSource { get; set; }
    public string LinkPhoneNumber { get; set; }
    public DateTime LinkDate { get; set; }
    public DateTime LinkCreatedDate { get; set; }
    public DateTime LinkModifiedDate { get; set; }

    public virtual ICollection<ContentTagAssignment> ContentTagAssignments { get; set; }
}

public class ContentTagAssignment
{
    public ContentTagAssignment()
    {
        this.ContentExternalLink = new ContentExternalLink();
    }

    [Key]
    public string TagId { get; set; }
    [Key]
    public string ArticleId { get; set; }
    public bool IsPrimary { get; set; }
    public DateTime CreatedDate { get; set; }

    public virtual ContentExternalLink ContentExternalLink { get; set; }
}

public class ContentExternalLinkMap : EntityTypeConfiguration<ContentExternalLink>
{
    public ContentExternalLinkMap()
    {
        this.ToTable("content_external_link", "dbo");

        this.HasKey(c => c.LinkId);

        this.Property(c => c.LinkId).HasColumnName("link_id");
        this.Property(c => c.LinkTypeId).HasColumnName("link_type_id");
        this.Property(c => c.LinkTitle).HasColumnName("link_title");
        this.Property(c => c.LinkUrl).HasColumnName("link_url");
        this.Property(c => c.LinkSource).HasColumnName("link_source");
        this.Property(c => c.LinkPhoneNumber).HasColumnName("link_phone_number");
        this.Property(c => c.LinkDate).HasColumnName("link_date");
        this.Property(c => c.LinkCreatedDate).HasColumnName("link_created_date");
        this.Property(c => c.LinkModifiedDate).HasColumnName("link_modified_date");
    }
}

public class ContentTagAssignmentMap : EntityTypeConfiguration<ContentTagAssignment>
{
    public ContentTagAssignmentMap()
    {
        this.ToTable("content_tag_assignment", "dbo");

        this.HasKey(t => new { t.TagId, t.ArticleId });

        this.Property(t => t.TagId).HasColumnName("tag_id");
        this.Property(t => t.ArticleId).HasColumnName("article_id");
        this.Property(t => t.IsPrimary).HasColumnName("is_primary_tag");
        this.Property(t => t.CreatedDate).HasColumnName("created_date");


        this.HasRequired(t => t.ContentExternalLink)
            .WithMany(t => t.ContentTagAssignments)
            .HasForeignKey(t => t.ArticleId)
            .WillCascadeOnDelete(false);
    }
}

这是上面代码的结果: