无法在Core Identity的ApplicationUser中保持关系

时间:2019-11-26 14:16:02

标签: c# asp.net-core asp.net-core-mvc entity-framework-core asp.net-core-identity

我找不到正确扩展ASP.NET Core的IdentityUser的方法(扩展后为ApplicationUser)。我可以覆盖它并从其他模型链接它,但是不能从用户链接到其他模型。像CustomTag这样的简单数据就可以使用。

问题的源代码:https://github.com/chanibal/CoreIdentityIssue
或者,具体来说,it's second commit that contains all the changes over the default template

我做了什么:

  1. 创建了新项目:
    ASP.NET Core Web应用程序(模型-视图-控制器)
    身份验证:单个用户帐户,在应用内存储用户帐户
    更新了数据库
  2. 更改了覆盖IdentityUser的模型(如official docs):

    public class ApplicationDbContext : IdentityDbContext<ApplicationUser>
    {
        public ApplicationDbContext(DbContextOptions<ApplicationDbContext> options)
            : base(options)
            {}
    
        public DbSet<Bar> Bars { get; set; }
        public DbSet<Foo> Foos { get; set; }
        public DbSet<ApplicationUser> ApplicationUsers { get; set; } //< doesn't help
    }
    
    public class ApplicationUser : IdentityUser
    {
        public string CustomTag { get; set; }   //< this works
        public Bar Bar { get; set; }            //< THIS DOES NOT WORK
    }
    
    public class Bar
    {
        public int Id { get; set; }
        public int Value { get; set; }
    }
    
    public class Foo
    {
        public int Id { get; set; }
        public ApplicationUser User { get; set; }   //< this works
    }
    

    ER diagram

    并迁移了更改

  3. 我通过以下方式更新Bar值:

    /// This should ensure a Bar is connected to a ApplicationUser
    /// and increment it's value
    [Authorize]
    public async Task<IActionResult> IncrementBar()
    {
        // This DOES NOT work
        var user = await _userManager.GetUserAsync(HttpContext.User);
        if (user.Bar == null)   //< this is always null
        {
            user.Bar = new Bar() { Value = 0 };
            // _context.Add(user.Bar); //< doesn't help
        }
        user.Bar.Value++;
        // await _userManager.UpdateAsync(user); //<> doesn't help
        // await _signInManager.RefreshSignInAsync(user);  //< doesn't help, starting to get desperate
        await _context.SaveChangesAsync();

        return RedirectToAction(nameof(Index));
    }

信息在数据库中,可以通过SQL访问。 但是不知何故,它不会使ApplicationUser模型充满水气:

SQL dump

使用Visual Studio 16.3.9

1 个答案:

答案 0 :(得分:2)

EF不会自动加载相关实体。您必须热切或显式加载关系。优先加载是首选方法,因为它确实会合并在一起以在单个查询中获取所有数据。但是,UserManager<TUser>无法提供热切的加载关系。因此,您有两种选择:

  1. 显式加载关系。不过,这将需要一个额外的查询。

    var user = await _userManager.GetUserAsync(HttpContext.User);
    await _context.Entry(user).Reference(x => x.Bar).LoadAsync();
    // note: for collection props, you'd use `Collection(x => x.CollectionProp).LoadAsync()` instead.
    
  2. 通过用户ID从上下文中查询用户,而不使用UserManager<TUser>

    var userId = User.FindFirstValue(ClaimTypes.NameIdentifier);
    var user = await _context.Users.Include(x => x.Bar).SingleOrDefaultAsync(x => x.Id == userId);