Question

这是一对多的模型（申请人）。（AttachedDocument）是很多模型，我认为我的关系有误

public partial class Applicant
{
    [Key]
    public int ApplicantID { get; set; }

    public string ApplicationSource { get; set; }

    public string Gender { get; set; }

    [ForeignKey("ApplicantID")]
    public virtual ICollection<AttachedDocuments> AttachedDocuments { get; set; }

}


public partial class AttachedDocuments
{
    [Key]
    public int AttachedDocID { get; set; }
    public int ApplicantID { get; set; }
    public string AttechedDocGUID { get; set; }
    public int DocumentTypeID { get; set; }

    [ForeignKey("ApplicantID")]
    public virtual ICollection<Applicant> Applicant { get; set; }
}

这里是构建器：

   protected override void OnModelCreating(DbModelBuilder modelBuilder)
    {
        base.OnModelCreating(modelBuilder);

        modelBuilder.Entity<Applicant>().HasRequired(a => a.AttachedDocuments).WithMany().HasForeignKey(a => a.ApplicantID);

        modelBuilder.Entity<AttachedDocuments>().HasOptional(b => b.Applicant).WithMany().HasForeignKey(b => b.ApplicantID);
    }

第一次建立具有关系的模型。预先感谢！

Answer 1

您是否尝试过从申请人的类别中删除外键属性？ ForeignKey属性指定将作为外键的属性的名称。您正在指定Key属性的名称，这将导致数据库翻转。

public partial class Applicant
{
    [Key]
    public int ApplicantID { get; set; }

    public string ApplicationSource { get; set; }

    public string Gender { get; set; }

    public virtual ICollection<AttachedDocuments> AttachedDocuments { get; set; }

}


public partial class AttachedDocuments
{
    [Key]
    public int AttachedDocID { get; set; }
    public string AttachedDocGUID { get; set; }
    public int DocumentTypeID { get; set; }

    public int ApplicantID { get; set; }
    [ForeignKey("ApplicantID")]
    public virtual Applicant Applicant { get; set; }
}

多重性在“角色”中无效。从属角色多重性的上限必须为“ 1”

1 个答案: