使用Identity将集合添加到ASP.NET Core中的用户对象

Question

我正在玩EF Core和ASP.NET Core，偶然发现了以下问题。我想以List的形式向User Object添加一些额外的数据。问题是列表永远不会更新。

这是我的DbContext：

public class ApplicationDbContext : IdentityDbContext<HostUser>
{
    public ApplicationDbContext(DbContextOptions<ApplicationDbContext> options) : base(options)
    {
    }
}

现在我的用户对象：

public class HostUser : IdentityUser
{
    [PersonalData]
    public ICollection<GuestUser> GuestUsers { get; set; }
}

这里是在Controller中添加新的访客用户：

[HttpPost]
    public async Task<IActionResult> Post([FromBody]GuestUser userToInsert)
    {
        if (userToInsert == null)
        {
            return BadRequest();
        }

        var currentUser = await GetCurrentUserAsync();
        if (currentUser == null)
        {
            return Forbid();
        }

        if(currentUser.GuestUsers?.Any(user => user.Id == userToInsert.Id) ?? false)
        {
            return BadRequest();
        }

        if(currentUser.GuestUsers == null)
        {
            currentUser.GuestUsers = new List<GuestUser>();
        }

        currentUser.GuestUsers.Add(userToInsert);
        await userManager.UpdateAsync(currentUser);

        return Ok();
    }

我的问题是，如果这是一个完全错误的方法，我必须在DbContext中添加一个GuestStser的DbSet并将其映射到用户。如果是这种情况我不知道如何实现这一目标。注意：在这种情况下，GuestUser不是另一个IdentityUser，它是本地用户数据

Answer 1

这是它的样子：

实体：

public class HostUser : IdentityUser
{
    public virtual ICollection<GuestUser> GuestUsers { get; set; }
}

public class GuestUser
{
    public int HostUserId { get; set; }
    public virtual HostUser HostUser { get; set; }
}

DB上下文：

public class ApplicationDbContext : IdentityDbContext<HostUser>
{
    public ApplicationDbContext(DbContextOptions<ApplicationDbContext> options)
        : base(options)
    {
    }

    public DbSet<GuestUser> GuestUsers { get; set; }

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

        builder.Entity<HostUser>(
            typeBuilder =>
            {
                typeBuilder.HasMany(host => host.GuestUsers)
                    .WithOne(guest => guest.HostUser)
                    .HasForeignKey(guest => guest.HostUserId)
                    .IsRequired();

                // ... other configuration is needed
            });

        builder.Entity<GuestUser>(
            typeBuilder =>
            {
                typeBuilder.HasOne(guest => guest.HostUser)
                    .WithMany(host => host.GuestUsers)
                    .HasForeignKey(guest => guest.HostUserId)
                    .IsRequired();

                // ... other configuration is needed
            });
    }
}

控制器动作：

[HttpPost]
public async Task<IActionResult> Post([FromBody] GuestUser userToInsert)
{
    // All checks and validation ...

    // You can get the current user ID from the user claim for instance
    int currentUserId = int.Parse(User.FindFirst(Claims.UserId).Value);

    // _context is your ApplicationDbContext injected via controller constructor DI 
    userToInsert.HostUserId = currentUserId;

    // Save new guest user associated with the current host user
    _context.GuestUsers.Add(userToInsert);
    await _context.SaveChangesAsync();

    // If you need to get the current user with all guests
    List<HostUser> currentUser = await _context.Users.Include(host => host.GuestUsers).ToListAsync();

    return Ok(currentUser);
}

在这里，我提供了完整的代码 - how to configure custom Identity based DB context（所有需要的自定义分类继承自IdentityDbContext使用的基类）。

Answer 2

有两个问题。

1.首先你应该分开ViewModelfrom实体（不要传递GuestUser作为参数的web / api方法）

2.然后如你所说，你应该在DBSet中声明GuestUser的DbContext并将其映射到用户表。

定义自定义用户实体

public class ApplicationUser : IdentityUser
{
    public string CustomTag { get; set; }
}

声明自定义DbContext

接下来使用此类型作为上下文的通用参数：

public class ApplicationDbContext : IdentityDbContext<ApplicationUser>
{
    public ApplicationDbContext(DbContextOptions<ApplicationDbContext> options)
        : base(options)
    {
    }

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

        modelBuilder.Entity<ApplicationUser>(b =>
        {
            // Each User can have many UserClaims
            b.HasMany(e => e.Claims)
                .WithOne()
                .HasForeignKey(uc => uc.UserId)
                .IsRequired();
        });
    }
}

更新ConfigureServices以使用新的ApplicationUser类：

services.AddDefaultIdentity<ApplicationUser>()
    .AddEntityFrameworkStores<ApplicationDbContext>();

如果您有任何其他问题，请告诉我。