EFCore选择错误的列名称

Question

我使用VSCode 创建了一个API .Net core并EFCore遵循本教程.

我有很多我的MySQL数据库的模型,因为我是"迁移"我EF6跟asp.net WebAPI到.Net core,所以我只是复制粘贴,避免了大量的工作(再次).

当我尝试做一个简单Get的事情时,EFCore连接两列不同的表:

控制器用户

[Route("v1/[controller]")]
public class UserController : Controller
{

    private readonly IntentContext _context;

    public UserController(IntentContext context)
    {
        _context = context;
    }

    [HttpGet]
    public IEnumerable<user> GetAll()
    {
        return _context.user.ToList();
    }
}

'用户'模型

public class user
{
    public user()
    {
        user_image = new HashSet<user_image>();
        user_credit_card = new HashSet<user_credit_card>();
        user_pocket_history = new HashSet<user_pocket_history>();
        user_pocket = new HashSet<user_pocket>();

        //A lot of table instances
    }

    public string id { get; set; }
    public string username { get; set; }
    public string password { get; set; }
    public string id_account_type { get; set; }
    public int user_status { get; set; }
    public DateTime create_time { get; set; }
    public DateTime update_time { get; set; }

    public virtual account_type account_type { get; set; }

    public virtual ICollection<user_image> user_image { get; set; }
    public virtual ICollection<user_credit_card> user_credit_card { get; set; }
    public virtual ICollection<user_pocket_history> user_pocket_history { get; set; }
    public virtual ICollection<user_pocket> user_pocket { get; set; }

    //A lot of table relations
}

表account_type

public class account_type
{
    public account_type()
    {
        this.user = new HashSet<user>();
        this.establishment_employee = new HashSet<establishment_employee>();
    }

    public string id { get; set; }
    public string account_description { get; set; }
    public string account_name { get; set; }
    public DateTime create_time { get; set; }
    public DateTime update_time { get; set; }

    public virtual ICollection<user> user { get; set; }
    public virtual ICollection<establishment_employee> establishment_employee { get; set; }
}

get请求期间的终端日志

fail: Microsoft.EntityFrameworkCore.Database.Command[20102]
  Failed executing DbCommand (140ms) [Parameters=[], CommandType='Text', CommandTimeout='30']
  SELECT `u`.`id`, `u`.`Id_account_type`, `u`.`account_typeid`, `u`.`create_time`, `u`.`password`, `u`.`update_time`, `u`.`user_status`, `u`.`username`
  FROM `user` AS `u`
MySql.Data.MySqlClient.MySqlException (0x80004005): Unknown column 'u.account_typeid' in 'field list' ---> MySql.Data.MySqlClient.MySqlException (0x80004005): Unknown column **'u.account_typeid'** in 'field list'
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()

//A lot of exceptions generated 

fail: Microsoft.EntityFrameworkCore.Query[10100]
  An exception occurred in the database while iterating the results of a query for context type 'IntentAPI.Models.IntentContext'.
  MySql.Data.MySqlClient.MySqlException (0x80004005): Unknown column 'u.account_typeid' in 'field list' ---> MySql.Data.MySqlClient.MySqlException (0x80004005): Unknown column 'u.account_typeid' in 'field list'
     at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()

请注意,该字段u.account_typeid确实不存在.这是一个串连account_type的user表id的account_type表.

为什么会这样？

非常感谢和抱歉我的英语

Answer 1

这在EF Core文档的关系 - 无外键属性部分中进行了解释:

如果未找到外键属性,则将引入带有名称的影子外键属性

<navigation property name> <主键属性名称>

您需要user.account_type通过数据注释为导航属性指定FK属性:

[ForeignKey("id_account_type")]
public virtual account_type account_type { get; set; }

或流利的API:

modelBuilder.Entity<user>()
    .HasOne(e => e.account_type)
    .WithMany(e => e.user)
    .HasForeignKey(e => e.id_account_type);