代码优先参考一对多

Question

我有以下两个表：

LOCALIZATION

Id                     int
Text                   string

DINER

Id                     int
Name                   string
Description            string
Name_LocalizationID    int
Description_LocationID int

现在我想要这样的 POCO：

public class Diner{
   public int Id{get;set;}
   public ICollection<Localization> NameLocalization{get;set;}
   public ICollection<Localization> DescriptionLocalization{get;set;} 
}

public class Localization{
   public int Id{get;set;}
   public string Text{get;set;}
}

问题是：我们如何使用 EF Fluent API 将 NameLocalization 和 DescriptionLocalization 属性映射到本地化的 Id？ 谢谢

Answer 1

SQL Server 不支持多个级联删除，因此您需要将其中一个关联设置为可选，以便从对象模型派生 SQL Server 架构：

protected override void OnModelCreating(ModelBuilder modelBuilder)
{
    modelBuilder.Entity<Diner>()
        .HasRequired(diner => diner.NameLocalization)
        .WithMany()
        .IsIndependent()
        .Map(s => 
        { 
            s.MapKey(localization => localization.Id, "NameLocalizationID"); 
        });

    modelBuilder.Entity<Diner>()
        .HasOptional(diner => diner.DescriptionLocalization)
        .WithMany()
        .IsIndependent()
        .Map(s => 
        { 
            s.MapKey(localization => localization.Id, "DescriptionLocationID"); 
        });
}

Answer 2

恐怕我还没有测试过这段代码，但也许是这样的：

modelBuilder.Entity<Diner>()
    .HasRequired(diner => diner.NameLocalization)
    .WithMany().IsIndependent()
    .Map(s => { s.MapKey(localization => localization.Id, "Name_LocalizationID"); });

modelBuilder.Entity<Diner>()
    .HasRequired(diner => diner.DescriptionLocalization)
    .WithMany().IsIndependent()
    .Map(s => { s.MapKey(localization => localization.Id, "Description_LocationID"); });