Question

VS2013，EF6

阅读了所有SO帖子后，这个帖子最接近The operation failed: The relationship could not be changed because one or more of the foreign-key properties is non-nullable但是我没有进行INSERT而且我没有删除任何内容（故意是，AutoMapper可能是＆＃34;导致该效果＆＃34;）

当我尝试按如下方式更新记录时，我收到此错误。最初的INSERT工作得很好。支持班：

 public class UpdateStructureInput : StructureTableModel, IInputDto
{
}

   [Table("Structures", Schema = "dbo")]
    public class StructureTableModel : EmEntityBase
    {
        #region Public Members

        [ForeignKey("ParentStructureId")]
        public virtual StructureTableModel ParentStructure { get; set; }

        public long? ParentStructureId { get; set; }

        [ForeignKey("SiteId")]
        public virtual SiteTableModel Site { get; set; }

        [Required(ErrorMessage = "Required.")]
        public long SiteId { get; set; }

        [Required(ErrorMessage = "Required.")]
        public string Name { get; set; }


        #endregion
    }

以下是更新Name字段后生成异常的代码，并将其他所有内容保留为相同的值：SiteId = 1，ParentStructureId = null：

public void UpdateStructure(UpdateStructureInput aInput)
{
    StructureTableModel structure = _StructureRepository.Get(aInput.Id);
    Mapper.Map(aInput, structure);
    _StructureRepository.Update(structure);
}

自动播放器定义为：

Mapper.CreateMap<UpdateStructureInput , StructureTableModel>();

更新要求的附加代码。存储库和实体类构建在http://www.aspnetboilerplate.com/之上，所以我没有在这里包含该源，因为它可以从NuGet获得。

 /// <summary>
    ///     Base class for all entities defined in the system. This allows for the following
    ///     COMMON features:
    ///     - Primary key "Id" of type long
    ///     - Auditing which adds Date & User information for creation and update
    /// </summary>
    public abstract class EmEntityCommon : AuditedEntity<long>
    {
    }

    /// <summary>
    ///     Extends the common functionality by adding the ability to mark a record as deleted rather than
    ///     deleting it from the database. Unless there is a reason not to mark an entity as a soft delete
    ///     then all entities should descend from this class.
    /// </summary>
    public class EmEntityBase : EmEntityCommon, ISoftDelete
    {
        #region Implementation of ISoftDelete

        /// <summary>
        ///     Used to mark an Entity as 'Deleted'.
        /// </summary>
        public bool IsDeleted { get; set; }

        #endregion
    }

public interface IStructureRepository : IRepository<StructureTableModel, long>
    {
    }

public class StructureRepository : EmRepositoryBase<StructureTableModel>, IStructureRepository
    {
    }

/ UPDATE

我猜这个由于某种原因，EF认为我在进行AutoMapper调用时会以某种方式孤立SiteId，将相同的值1分配给它？

如何解决此问题？

实体框架错误 - 无法更改关系，因为一个或多个外键属性不可为空

0 个答案: