c# - 同一类上的多对多关系不起作用

Question

我正在尝试使用 EFCore 在同一用户类上创建多对多关系，该用户类基于 EntityFrameworkCore.IdentityUser，遵循描述的说明 here , here和 here 。我有以下用户类别:

public class MyApplicationUser : IdentityUser
{
    public virtual ICollection<MyApplicationUserJunction> MyApplicationUsers { get; set; }
    public virtual ICollection<MyApplicationUserJunction> ManagingMyApplicationUsers { get; set; }
}

这是我的连接表:

public class MyApplicationUserJunction
{
    public int MyApplicationUserId { get; set; }
    public virtual MyApplicationUser MyApplicationUser { get; set; }
    public int ManagedMyApplicationUserId { get; set; }
    public virtual MyApplicationUser ManagedMyApplicationUser { get; set; }
}

这是我的 OnModelConfiguring:

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

    builder.Entity<MyApplicationUserJunction>()
        .HasKey(uj => new { uj.ManagedMyApplicationUserId, uj.MyApplicationUserId});

    builder.Entity<MyApplicationUserJunction>()
        .HasOne(uj => uj.MyApplicationUser)
        .WithMany(qu => qu.MyApplicationUsers)
        .HasForeignKey(uj => uj.MyApplicationUserId).OnDelete(DeleteBehavior.Restrict);

    builder.Entity<MyApplicationUserJunction>()
        .HasOne(uj => uj.ManagedMyApplicationUser)
        .WithMany(qu => qu.ManagingMyApplicationUsers)
        .HasForeignKey(uj => uj.ManagedMyApplicationUserId);
}

每当我运行 EFCore 工具添加迁移命令时，都会收到以下错误:

The relationship from 'MyApplicationUserJunction.MyApplicationUser' to 'MyApplicationUser.MyApplicationUsers' with foreign key properties {'MyApplicationUserId' : int} cannot target the primary key {'Id' : string} because it is not compatible. Configure a principal key or a set of compatible foreign key properties for this relationship.

我正在使用 EntityFrameworkCore.Tools.DotNet 包 1.0.0-preview3-final。

我尝试仅在 User 类上使用单个导航属性，并且尝试不指定 WithMany 函数，如here所述。但没有成功。

Answer 1

为了使其与 EF Core 1 一起工作，按照上面 Rufo 爵士的建议，我指定了 TKey 的类型:

public class MyApplicationUser : IdentityUser<int>
{
    public virtual ICollection<MyApplicationUserJunction> MyApplicationUsers { get; set; }
    public virtual ICollection<MyApplicationUserJunction> ManagingMyApplicationUsers { get; set; }
}

在上下文中:

public class MyApplicationContext : IdentityDbContext<MyApplicationUser, IdentityRole<int>, int>
{
    ...

在ConfigureServices 的AddIdentity 部分中，它也使用通用IdentityRole:

services.AddIdentity<MyApplicationUser, IdentityRole<int>>(config =>
        {
            config.User.RequireUniqueEmail = true;
            config.Password.RequiredLength = 8;
            config.Cookies.ApplicationCookie.LoginPath = "/Auth/Login";
        })
        .AddEntityFrameworkStores<MyApplicationContext, int>();

然后，我将其升级到 EF Core 2，这需要进行一些其他更改才能使身份正常工作。正如pealmeid here所述您必须从 IdentityRole 派生:

public class MyRole : IdentityRole<int>
{
    public MyRole() : base()
    {
    }

    public MyRole(string roleName)
    {
        Name = roleName;
    }
}

在配置服务中使用:

public void ConfigureServices(IServiceCollection services)
        {
            services.AddIdentity<MyApplicationUser, MyRole>(config =>
            {
                config.User.RequireUniqueEmail = true;
                config.Password.RequiredLength = 8;
            }).AddEntityFrameworkStores<MyApplicationContext>();
            ...

我之前也使用过 cookie 身份验证，该身份验证不再在 AddIdentity 配置 lambda 中配置，而是在服务级别完成:

public void ConfigureServices(IServiceCollection services)
    {
        services.ConfigureApplicationCookie(options => options.LoginPath = "/Auth/Login");
        ...

还对 DbContext 签名进行了轻微更改以使用派生角色类型:

public class MyApplicationContext : IdentityDbContext<MyApplicationUser, MyRole, int>
{