Question

我收到一个关于两个实体约束的错误，我对此感到头疼。我用谷歌搜索并仔细检查并尝试了建议，但仍然没有运气。我得到的错误如下： -

引入FOREIGN KEY约束桌上的'FK_dbo.UserTrackableItems_dbo.Users_ModifiedById' 'UserTrackableItems'可能会导致循环或多个级联路径。指定ON DELETE NO ACTION或ON UPDATE NO ACTION，或修改其他 FOREIGN KEY约束。无法创建约束或索引。看到以前的错误。

我理解错误，但没有看到修复它的位置。我删除了[必需]，我尝试使用流畅的API，我一定做错了。这些是它提到的实体（其中一个是基类）。

[Table("UserTrackableItems")]
public class UserTrackableItem : BaseEntity
{
    [Key]
    public long UserTrackableItemId { get; set; }

    [Required]
    public long UserId { get; set; }
    [ForeignKey("UserId")]
    public virtual User User { get; set; }

    [Required]
    public int TrackableItemId { get; set; }
    [ForeignKey("TrackableItemId")]
    public virtual TrackableItem TrackableItem { get; set; }

    [Required]
    public int OrderBy { get; set; }
}

[Table("Users")]
public class User : BaseEntity
{
    [Key]
    public long UserId { get; set; }
    public string Forename { get; set; }
    public string Surname { get; set; }
    public string Email { get; set; }
    public string Password { get; set; }
    public string Hash { get; set; }
    public string AvatarImage { get; set; }
    public DateTime? DateOfBirth { get; set; }
    public int? CountryId { get; set; }
    public DateTime MemberSince { get; set; }
    public bool IsAdmin { get; set; }
    public bool IsWriter { get; set; }
    public bool IsStaff { get; set; }
    public bool IsBanned { get; set; }

    public string OpenId { get; set; }
    public string OpenIdClaim { get; set; }
    public ExternalAuthOrigin ExternalAuthOrigin { get; set; }

    public virtual ICollection<DailyTarget> DailyTargets { get; set; }
    public virtual ICollection<SectionTarget> MealTargets { get; set; }
    public virtual ICollection<Section> Meals { get; set; }
    public virtual ICollection<UserTrackableItem> TrackableItems { get; set; }
}

    public class BaseEntity
{
    public DateTime AddedDate { get; set; }

    public long AddedById { get; set; }

    [ForeignKey("AddedById")]
    public virtual User AddedBy { get; set; }

    public DateTime? DeletedDate { get; set; }

    public long? DeletedById { get; set; }

    [ForeignKey("DeletedById")]
    public virtual User DeletedBy { get; set; }

    public DateTime ModifiedDate { get; set; }

    public long ModifiedById { get; set; }

    [ForeignKey("ModifiedById")]
    public virtual User ModifiedBy { get; set; }
}

[Table("TrackableItems")]
public class TrackableItem
{
    [Key]
    public int TrackableItemId { get; set; }

    [Required]
    public string Name { get; set; }

    public string MeasurementName { get; set; }

    public virtual ICollection<UserTrackableItem> Users { get; set; }

}

外键约束的EF迁移错误

0 个答案: