c# - EFCore选择错误的列名

在this教程之后，我使用VSCode创建了.Net core和EFCore的API。

我有很多MySQL数据库模型，因为我正在将EF6和asp.net WebAPI迁移到.Net core，所以我只是复制并粘贴以避免很多工作（再次）。

当我尝试做一个简单的Get时，EFCore串联了两列不同的表：

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; }
}

获取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，字段u.account_typeid确实不存在。它是account_type表的user和id表的account_type的串联。

为什么会这样呢？

非常感谢和抱歉我的英语不好

最佳答案

EF核心文档的Relationships - No Foreign Key Property部分对此进行了说明：


  如果找不到外键属性，则将引入影子外键属性，其名称为
  
  


您需要通过以下任一数据注释为user.account_type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);

关于c# - EFCore选择错误的列名，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/50054611/