一对多关系中的多重性错误

Question

我有多个嵌套在一起的实体，当我尝试添加调查类时出现错误

违反了多重性约束。关系“SurveyMonkeyAPIv3.Response_Pages”的角色“Response_Pages_Source”具有多重性 1 或 0..1。

因为它们都继承了Entity

public abstract class Entity  :IEquatable<Entity>
{

    [DataMember]
    public virtual long Id { get; set; }

    public override int GetHashCode()
    {
        return Convert.ToInt16(Id);
    }

    public bool Equals(Entity other)
    {
        return false;
    }
}

调查实体

public class Survey : Entity, IEquatable<Survey>
{
//More fields//
    [DataMember]
    public string AnalyzeUrl { get; set; }


    [DataMember]
    [DatabaseGenerated(DatabaseGeneratedOption.None)]
    public override long Id { get; set; }

    [DataMember]
    public string Language { get; set; }

    [DataMember]
    public int? PageCount { get; set; }
    [DataMember]
    public virtual List<Page> Pages { get; set; }
    [DataMember]
    public string Preview { get; set; }
    //More Fields
    public bool Equals(Survey other)
    {
        return this.Id == other.Id;
    }
}

和页面

public class Page : Entity, IEquatable<Page>
{
    [DataMember]
    public string Description { get; set; }

    [DataMember]

    [DatabaseGenerated(DatabaseGeneratedOption.None)]
    public new long? Id { get; set; }

    [DataMember]
    public int? Position { get; set; }

    [DataMember]
    public int? QuestionCount { get; set; }
   //More Objects

    // public long SurveyId { get; set; }
    // public List< Survey> Survey   { get; set; }
    //tried including these , can't set in my automappers

但我找不到解决此问题的方法。

添加：

被指向 Response Entity ，随后

public class Response : Entity, IEquatable<Response>
{
    [DataMember]
    public string AnalyzeUrl { get; set; }

    [DataMember]
    public CollectionMode? CollectionMode { get; set; }

    [DataMember]
    public long? CollectorId { get; set; }

    [DataMember]
    public string CustomValue { get; set; }

    //[DataMember]
    //public Dictionary<string, string> CustomVariables { get; set; }

    [DataMember]
    public DateTime? DateCreated { get; set; }

    [DataMember]
    public DateTime? DateModified { get; set; }

    [DataMember]
    public string EditUrl { get; set; }

    [DataMember]

    [DatabaseGenerated(DatabaseGeneratedOption.None)]
    public new long? Id { get; set; }

    [DataMember]
    public string IpAddress { get; set; }

    //[DataMember]
    //public Dictionary<string, object> LogicPath { get; set; }

    //[DataMember]
    //public Dictionary<string, object> Metadata { get; set; }
    [DataMember]
    public virtual List<object> PagePath { get; set; }

    [DataMember]
    public virtual List<ResponsePage> Pages { get; set; }
    [DataMember]
    public virtual List<ResponseQuestion> Questions { get; }

    [DataMember]
    public long? RecipientId { get; set; }

    [DataMember]
    public ResponseStatus? ResponseStatus { get; set; }

    [DataMember]
    public long? SurveyId { get; set; }

    [DataMember]
    public int? TotalTime { get; set; }

    public bool Equals(Response other)
    {
        return Id == other.Id;
    }
}

Answer 1

用 标记调查属性（来自页面），实际上您需要添加一个新属性：

[ForeignKey("SurveyId")]
[DataMember]
public Survey Survey {get;set;}

以及来自调查的页面列表：

 [InverseProperty(nameof(Page.Survey))]