种子一对一关系 ASP .NET MVC

Question

我正在使用 ASP .NET MVC5 和 EF6 构建一个 Web 应用程序。

我正在尝试将数据播种到这样定义的一对一关系：

模型

public class Client 
{
  public int ClientId { get; set; }  
  [Required]
  public string Name { get; set; }

  public Address Address { get; set; }
}

public class Address 
{
  [ForeignKey("Client")]
  public int AddressId { get; set; }  
  [Required]
  public string StreetName { get; set; }

  public Client Client { get; set; }
}

地址是从属端。

现在，我想使用 EF 为这两个表添加种子，并在 /Migrations/Configuration.cs 中添加了以下代码：

internal sealed class Configuration : DbMigrationsConfiguration<MR_TrackTrace.Models.ApplicationDbContext>
    {
        public Configuration()
        {
            AutomaticMigrationsEnabled = false;
        }

        protected override void Seed(MR_TrackTrace.Models.ApplicationDbContext context)
        {

            var clients = new List<Client>
            {
                new Client { Name = "John" },
                new Client { Name = "Mary" },
                new Client { Name = "Philip" }
            };

            clients.ForEach(s => context.Clients.AddOrUpdate(p => p.Name, s));

            context.SaveChanges();
            var addresses = new List<Address>
            {
                new Address { StreetName = "something", Client = clients.FirstOrDefault(s => s.Name == "John") },
                new Address { StreetName = "other", Client = clients.FirstOrDefault(s => s.Name == "Philip") },
                new Address { StreetName = "another", Client = clients.FirstOrDefault(s => s.Name == "Mary") }
            };

            addresses.ForEach(s => context.Addresses.AddOrUpdate(p => p.Name, s));
            context.SaveChanges();
        }
 }

现在，在添加迁移和更新数据库之后，我检查了表，客户端是根据构建和播种的，但是地址表有一个名为 ClientId 的列，因为它是外键。

但是此列没有填充预期的 ID，而是填充了“0”。通过使用：

Client = clients.FirstOrDefault(s => s.Name == "John")

我希望上下文会自动为该表设置 ClientId。

谁能帮我指导我解决这个问题？ 提前致谢！

Answer 1

通过播种解决了我的问题，如下所示：

 protected override void Seed(MR_TrackTrace.Models.ApplicationDbContext context)
        {

            var clients = new List<Client>
            {
                new Client { Name = "John" },
                new Client { Name = "Mary" },
                new Client { Name = "Philip" }
            };

            clients.ForEach(s => context.Clients.AddOrUpdate(p => p.Name, s));

            context.SaveChanges();
            var addresses = new List<Address>
            {
                new Address { StreetName = "something", ClientId = context.Clients.FirstOrDefault(s => s.Name == "John").ClientId },
                new Address { StreetName = "other", ClientId = context.Clients.FirstOrDefault(s => s.Name == "Philip").ClientId },
                new Address { StreetName = "another", ClientId = context.Clients.FirstOrDefault(s => s.Name == "Mary").ClientId }
            };

            addresses.ForEach(s => context.Addresses.AddOrUpdate(p => p.Name, s));
            context.SaveChanges();
        }

还是不知道为什么 EF 无法链接两个表并自动将 ClientId 填充到 Address 表中。

谢谢！

Answer 2

你不能这样添加地址吗：

var clients = new List<Client>
{
    new Client { Name = "John", Address = new Address() { StreetName = "Something" } },
    new Client { Name = "Mary", Address = new Address() { StreetName = "Other" }  },
    new Client { Name = "Philip", Address = new Address() { StreetName = "Another" }  }
};

当它保存更改时，它应该同时创建客户端和地址并将它们链接在一起