具有导航属性的EF6一对多流利api

Question

我正在尝试使用EF6和fluent API对我的实体进行一对多的操作，但仍然出现此错误：

EmailTemplate_Attachments_Source_EmailTemplate_Attachments_Target :：关系约束中的从属角色和主体角色的属性数必须相同。

这些是我的模型：

public class EmailTemplate
{
    public EmailTemplate()
    {
        Attachments = new List<EmailTemplateAttachment>();
    }

    public int EmailTemplateId { get; set; }
    public int OperatorId { get; set; }
    public EmailTemplateType MailType { get; set; }
    public int LanguageId { get; set; }
    public string Subject { get; set; }
    public string Content { get; set; }
    public string FromEmail { get; set; }
    public DateTime CreationDate { get; set; }

    public virtual ICollection<EmailTemplateAttachment> Attachments { get; set; }
}

public class EmailTemplateAttachment
{
    public int EmailTemplateAttachmentId { get; set; }
    public string ShortDescription { get; set; }
    public string FilePath { get; set; }
    public int EmailTemplateId { get; set; }

    public virtual EmailTemplate EmailTemplate { get; set; }

}

这些是实体配置

public EmailTemplateConfiguration()
    {
        ToTable("T_EMAILS");

        HasKey(emailTemplate => new { emailTemplate.OperatorId, emailTemplate.MailType, emailTemplate.LanguageId });
        HasMany(t => t.Attachments)
            .WithRequired(a => a.EmailTemplate)
            .HasForeignKey(a => a.EmailTemplateId);

        Property(emailTemplate => emailTemplate.EmailTemplateId).HasColumnName("row_id")
            .HasDatabaseGeneratedOption(DatabaseGeneratedOption.Identity);
        Property(emailTemplate => emailTemplate.OperatorId).HasColumnName("operator_id");
        Property(emailTemplate => emailTemplate.MailType).HasColumnName("mail_type");
        Property(emailTemplate => emailTemplate.LanguageId).HasColumnName("language_id");
        Property(emailTemplate => emailTemplate.Subject).HasColumnName("subject");
        Property(emailTemplate => emailTemplate.Content).HasColumnName("mail_content");
        Property(emailTemplate => emailTemplate.FromEmail).HasColumnName("from_email");
        Property(emailTemplate => emailTemplate.CreationDate).HasColumnName("insert_date");

    }

 public EmailTemplateAttachmentConfiguration()
    {
        ToTable("T_EMAILS_ATTACHMENTS");

        HasKey(a => a.EmailTemplateAttachmentId);
        HasRequired(a => a.EmailTemplate)
            .WithMany(t => t.Attachments)
            .HasForeignKey(a => a.EmailTemplateId);

        Property(a => a.EmailTemplateAttachmentId).HasColumnName("attachment_id")
            .HasDatabaseGeneratedOption(DatabaseGeneratedOption.Identity);
        Property(a => a.ShortDescription).HasColumnName("short_description");
        Property(a => a.FilePath).HasColumnName("file_url");
        Property(a => a.EmailTemplateId).HasColumnName("mail_id");

    }

我究竟做错了什么？ 我已经尝试了很多等待，以配置外键并不断获得相同的异常。

Answer 1

在您的EmailTemplateConfiguration中，您定义EmailTemplate的主键为复合键：

HasKey(emailTemplate => new { emailTemplate.OperatorId, emailTemplate.MailType, emailTemplate.LanguageId });

但是，在EmailTemplateAttachmentConfiguration中，您将依赖项配置为使用EmailTemplateId作为外键，这与上面定义的主键不同。 外键应与主体表主键相同。

另外，您还要两次定义EmailTemplate和EmailTemplateAttachment之间的关系（在EmailTemplateConfiguration中定义一个，在EmailTemplateAttachmentConfiguration中定义一个）。 多余，一个就够了