EF代碼優先CTP5 - 使用屬性作爲列名的名稱外鍵

Question

考慮以下模型：

public class Foo 
{ 
    public int Id { get; set;} 
    public Bar TheBar { get; set; } 
} 

public class Bar 
{ 
    public int Id { get; set;} 
} 

EF嘗試生成的FK列BarId。

如何使其使用TheBar？

我已經試過如下：

protected override void OnModelCreating(ModelBuilder modelBuilder) 
{ 
    modelBuilder.Entity<Foo>() 
       .HasOptional(x => x.Bar) 
       .WithMany() 
       .IsIndependent() 
       .Map(x => x.MapKey(bar => bar.Id, "TheBar")); 
} 

但試圖使用上下文時，我得到以下異常：

Exception has been thrown by the target of an invocation. 
---> System.InvalidOperationException: Sequence contains more than one matching element 

Server stack trace: 
    at System.Linq.Enumerable.SingleOrDefault[TSource](IEnumerable`1 source, Func`2 predicate) 
    at System.Data.Entity.ModelConfiguration.Configuration.Properties.Navigation.IndependentAssociationMappingConfiguration`1.Configure(DbAssociationSetMapping associationSetMapping) 
    at System.Data.Entity.ModelConfiguration.Configuration.Properties.Navigation.NavigationPropertyConfiguration.Configure(DbDatabaseMapping databaseMapping) 
    at System.Data.Entity.ModelConfiguration.Utilities.IEnumerableExtensions.Each[T](IEnumerable`1 ts, Action`1 action) 
    at System.Data.Entity.ModelConfiguration.Configuration.Types.EntityTypeConfiguration.ConfigureAssociationMappings(DbDatabaseMapping databaseMapping) 
    at System.Data.Entity.ModelConfiguration.Configuration.Types.EntityTypeConfiguration.Configure(DbEntityTypeMapping entityTypeMapping, DbDatabaseMapping databaseMapping, DbProviderManifest providerManifest) 
    at System.Data.Entity.ModelConfiguration.Configuration.ModelConfiguration.Configure(DbDatabaseMapping databaseMapping, DbProviderManifest providerManifest) 
    at System.Data.Entity.ModelConfiguration.ModelBuilder.Build(DbProviderManifest providerManifest, DbProviderInfo providerInfo, Boolean validateModel) 
    at System.Data.Entity.ModelConfiguration.ModelBuilder.Build(DbConnection providerConnection) 
    at System.Data.Entity.Internal.LazyInternalContext.CreateModel() 
    at System.Lazy`1.CreateValue() 

Exception rethrown at [0]: 
    at System.Linq.Enumerable.SingleOrDefault[TSource](IEnumerable`1 source, Func`2 predicate) 
    at System.Data.Entity.ModelConfiguration.Configuration.Properties.Navigation.IndependentAssociationMappingConfiguration`1.Configure(DbAssociationSetMapping associationSetMapping) 
    at System.Data.Entity.ModelConfiguration.Configuration.Properties.Navigation.NavigationPropertyConfiguration.Configure(DbDatabaseMapping databaseMapping) 
    at System.Data.Entity.ModelConfiguration.Utilities.IEnumerableExtensions.Each[T](IEnumerable`1 ts, Action`1 action) 
    at System.Data.Entity.ModelConfiguration.Configuration.Types.EntityTypeConfiguration.ConfigureAssociationMappings(DbDatabaseMapping databaseMapping) 
    at System.Data.Entity.ModelConfiguration.Configuration.Types.EntityTypeConfiguration.Configure(DbEntityTypeMapping entityTypeMapping, DbDatabaseMapping databaseMapping, DbProviderManifest providerManifest) 
    at System.Data.Entity.ModelConfiguration.Configuration.ModelConfiguration.Configure(DbDatabaseMapping databaseMapping, DbProviderManifest providerManifest) 
    at System.Data.Entity.ModelConfiguration.ModelBuilder.Build(DbProviderManifest providerManifest, DbProviderInfo providerInfo, Boolean validateModel) 
    at System.Data.Entity.ModelConfiguration.ModelBuilder.Build(DbConnection providerConnection) 
    at System.Data.Entity.Internal.LazyInternalContext.CreateModel() 
    at System.Lazy`1.CreateValue() 
    at System.Lazy`1.LazyInitValue() 
    at System.Data.Entity.Internal.LazyInternalContext.InitializeContext() 
    at System.Data.Entity.Internal.InternalContext.GetEntitySetAndBaseTypeForType(Type entityType) 
    at System.Data.Entity.Internal.Linq.InternalSet`1.Initialize() 
    at System.Data.Entity.Internal.Linq.InternalSet`1.get_Provider() 
    at System.Linq.Queryable.FirstOrDefault[TSource](IQueryable`1 source) 
    --- End of inner exception stack trace --- 
    at System.RuntimeMethodHandle._InvokeMethodFast(IRuntimeMethodInfo method, Object target, Object[] arguments, SignatureStruct& sig, MethodAttributes methodAttributes, RuntimeType typeOwner) 
    at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture, Boolean skipVisibilityChecks) 
    at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture) 
    at System.Reflection.MethodBase.Invoke(Object obj, Object[] parameters) 

Answer 1

錯誤是由CTP5中的錯誤引起的。如果Id屬性是在基類中定義的（由於我認爲它沒有關聯，所以在上面的代碼中沒有顯示），它會中斷。

我通過定義一個基本接口來解決它，但在每個類中保留了Id。

Answer 2

要在fluent interface的MapKey方法。或者，如果您在整個模型中都這樣做，則CTP 5具有可插入的約定，儘管這是AFAIK，但尚未完整記錄。