將類映射到多個表

Question

我有一個無法映射到一個顯式表的類。它所映射的表取決於使用它的上下文。基本上它應該如同我試圖將IDictionary<string, int>綁定到表格一樣工作。

// this is a mapped entity, with a Guid Id, but it can't be mapped to one explicit table 
public class NoTableClass : Entity<Guid> 
{ 

} 

// the table that this class gets its MyCollectionContext1 from depends on the HasMany mapping for that property 
public class MappedClass1 : Entity<Guid> 
{ 
    public IEnumerable<NoTableClass> MyCollectionContext1 { get; set; } 
} 

// the table that this class gets its MyCollectionContext2 from depends on the HasMany mapping for that property 
public class MappedClass2 : Entity<Guid> 
{ 
    public IEnumerable<NoTableClass> MyCollectionContext2 { get; set; } 
} 


// Mapping overrides 

public void Override(AutoMapping<MappedClass1> mapping) 
{ 
    mapping.HasMany(Reveal.Member<MappedClass1, IEnumerable<NoTableClass>>("MyCollectionContext1")) 
     .Table("Table1") 
     .Access.Field() 
     .Cascade.AllDeleteOrphan(); 
} 

public void Override(AutoMapping<MappedClass2> mapping) 
{ 
    mapping.HasMany(Reveal.Member<MappedClass2, IEnumerable<NoTableClass>>("MyCollectionContext2")) 
     .Table("Table2") 
     .Access.Field() 
     .Cascade.AllDeleteOrphan(); 
} 

好像忽略了NHibernate的集合時有一個自定義類.Table()映射方法。我不明白爲什麼可以用這種方式映射簡單類型的字典，但是具有自定義類的集合不能。

注意：我有我的理由不想使用繼承/泛型來解決這個問題，並且不想讓我映射到每個表的具體類型。我們有一個使用泛型的工作解決方案，但它爲我們創造了其他問題。

Answer 1

我認爲你正在嘗試做的可以用組件來實現：

public static void Override(AutoMapping<MappedClass1> mapping) { 
    mapping.HasMany(Reveal.Member<MappedClass1, IEnumerable<NoTableClass>>("MyCollectionContext1")) 
      .Component(c => { 
       c.Map(x => x.Id); 
       c.Map(x => x.Name); 
      }) 
      .Table("Table1") 
      .Cascade.AllDeleteOrphan(); 
} 

public static void Override(AutoMapping<MappedClass2> mapping) { 
    mapping.HasMany(Reveal.Member<MappedClass2, IEnumerable<NoTableClass>>("MyCollectionContext2")) 
      .Component(c => { 
       c.Map(x => x.Id); 
       c.Map(x => x.Name); 
      }) 
      .Table("Table2") 
      .Cascade.AllDeleteOrphan(); 
} 

這是一起玩的代碼：https://gist.github.com/4620069