映射與Fluent NHibernate的多對多關係，其中一個關係是組件

Question

我有以下類結構。

public class SearchTarget : IEntity { 
    public virtual String Name { get; set; } 
} 

public partial class PoliceAssistance { 
    public virtual Search SearchWithWarrant { get; set; } 
    public virtual Search SearchWithoutWarrant { get; set; } 

    public class Search : IEntityComponent { 
     public virtual IList<SearchTarget> Targets { get; set; } 
    } 
} 

IEntityComponent確保PoliceAssistance.Search如在功能NHibernate自動映射的部件，也就是SearchWithWarrant和SearchWithoutWarrant被存儲在相同的PoliceAssistance表處理。

問題

PoliceAssistance.Search.Targets和SearchTarget必須有許多一對多的關係 - 一個搜索可以包含許多目標和一個目標可以在許多搜索中顯示。

如果我在PoliceAssistance.Search指定單向.HasManyToMany()映射，我得到一個「空值違反非空約束」當我試圖挽救實體 - 即使兩個SearchWithWarrant和SearchWithoutWarrant被實例化，並在列表中的至少一個Target 。

如果我嘗試雙向指定映射，通過引入public virtual IList<PoliceAssistance.Search> InSearches { get; set; }財產爲SearchTarget與.HasManyToMany().Inverse()映射它，我得到一個映射錯誤，指出PoliceAssistance.Search不能被引用，因爲它沒有被映射（我猜的映射類型作爲組件AREN」考慮映射？）。

我應該如何解決這個問題？

Answer 1

這個戰鬥多一些後，我放棄了試圖獲得的映射與PoliceAssistance.Search作爲工作組件，而是將其轉變爲單獨的實體。這需要最少的變化，並按預期工作：

// Classes 
public class SearchTarget : IEntity { 
    public virtual String Name { get; set; } 
} 

public partial class PoliceAssistance { 
    public virtual Search SearchWithWarrant { get; set; } 
    public virtual Search SearchWithoutWarrant { get; set; } 

    public class Search : IEntity { 
     public virtual int Id { get; set; } 
     public virtual IList<SearchTarget> Targets { get; set; } 
    } 
} 

// Mapping 
public class PoliceAssistanceMap : IAutoMappingOverride<PoliceAssistance> { 
    public void Override(AutoMapping<PoliceAssistance> map) { 
     map.References(x => x.SearchWithWarrant) 
      .Cascade.All(); 
     map.References(x => x.SearchWithoutWarrant) 
      .Cascade.All(); 
    } 
} 

public class SearchMap : IAutoMappingOverride<PoliceAssistance.Search> { 
    public void Override(AutoMapping<PoliceAssistance.Search> mapping) { 
     mapping.HasManyToMany(x => x.Targets); 
    } 
} 

Answer 2

我對流利NHibernate引擎一無所知，但多對多的連接總是通過鏈接表/對象進行的。所以，我希望，你將有這樣的事情：

public class SearchTarget : IEntity 
{ 
    public virtual String Name { get; set; } 
    public virtual IList<Search_SearchTarget_Link> Searches { get; set; } 
} 

public class Search : IEntityComponent 
{ 
    public virtual IList<Search_SearchTarget_Link> Targets { get; set; } 
} 

public class Search_SearchTarget_Link : IEntity 
{ 
    public virtual Search search { get; set; } 
    public virtual SearchTarget searchtarget { get; set; } 
} 

public partial class PoliceAssistance 
{ 
    public virtual Search SearchWithWarrant { get; set; } 
    public virtual Search SearchWithoutWarrant { get; set; } 
} 

希望這有助於...