EF Core Fluent API 与两个相同类型实体的映射关系

Question

我一直在尝试使用流畅的 api 为下图配置适当的映射。（如果有人将其标记为重复，看在上帝的份上，请包括相关内容 link！我花了好几天时间梳理 Whosebug。）

我的主要目标是所有实体都将有一个 EnterpriseID 用作分片键。

企业 table 包含两个联系人，一个是 PrimaryContact 一个是 BillingContact。

我想做的是使用生成的代码 GUID ID 以及两个联系人（主要和计费）创建一个新企业，分配 Enterprise ID 并在 TrackingState 上调用 SaveChanges。添加了对象层次结构（此时为 Enterprise->Contacts- >地址。

没有任何 Fluent 映射，EF Core 2.1 说.. "Both relationships between 'Contact' and 'Enterprise.BillingContact' and between 'Contact' and 'Enterprise.PrimaryContact' could use {'EnterpriseID'} as the foreign key. To resolve this configure the foreign key properties explicitly on at least one of the relationships."

我尝试了很多配置，要么最终得到的数据库只定义了企业 table 中的一个 Contact 属性，要么整个混乱变成了 FK/循环地狱。

这是当前 class 个存根..

public class Enterprise
{
  public Guid ID {get; set;}
  public Contact PrimaryContact {get; set;}
  public Contact BillingContact {get; set;}
}

public class Contact
{
  public Guid ID {get; set;}
  public Guid EnterpriseID {get; set;}
  public string FName {get; set;}
  public string LName {get; set;}
  public Address Address {get; set;}
}

public class Store
{
  public Guid ID {get; set;}
  public Guid EnterpriseID {get; set;}
  public Contact PrimaryContact {get; set;}
}

public class Order
{
  public Guid ID {get; set;}
  public Guid EnterpriseID {get; set;}
  public Guid StoreID {get; set;}
  public Contact CustomerContact {get; set;}
}

public class Address
{
  public Guid ID {get; set;}
  public Guid EnterpriseID {get; set;}
  public string Lines {get; set;}
}

我非常感谢有关如何配置它的建议。

Answer 1

The Enterprise table contains two Contacts, a PrimaryContact and a BillingContact.

那么Enterprise、Contact和Address之间的关系应该是这样的：

public class Enterprise
{
    [Key]
    public Guid ID { get; set; }

    public Guid PrimaryContactId { get; set; }
    public Contact PrimaryContact { get; set; }

    public Guid BillingContactId { get; set; }
    public Contact BillingContact { get; set; }
}

public class Contact
{
    [Key]
    public Guid ID { get; set; }
    public string FName { get; set; }
    public string LName { get; set; }

    public Address Address {get; set;}
}

public class Address
{
   [Key]
   public Guid ContactId {get; set;}
   public string Lines {get; set;}
}

然后在Fluent API配置中：

protected override void OnModelCreating(ModelBuilder modelBuilder)
{
    base.OnModelCreating(modelBuilder);

    modelBuilder.Entity<Enterprise>().HasOne(e => e.PrimaryContact)
            .WithOne()
            .HasForeignKey<Enterprise>(e => e.PrimaryContactId).OnDelete(DeleteBehavior.Restrict);

    modelBuilder.Entity<Enterprise>().HasOne(e => e.BillingContact)
            .WithOne()
            .HasForeignKey<Enterprise>(e => e.BillingContactId).OnDelete(DeleteBehavior.Restrict);

   modelBuilder.Entity<Contact>().HasOne(c => c.Address)
            .WithOne().HasForeignKey<Address>(a => a.ContactId);
}

EF Core Fluent API 与两个相同类型实体的映射关系

Mapping Relationships with EF Core Fluent API with two entities of the same type

entity-framework-core

ef-core-2.1