EF Core 2.0 Identity - 添加导航属性

在 EF Core 2.0 中，默认情况下不包含 Identity 导航属性，因此在升级后，我添加了它们。因此，对于用户和角色之间的多对多关系以及角色和 RoleClaim 之间的一对多关系，我添加了以下导航属性：

public class User : IdentityUser
{
    [Required]
    public string Name { get; set; }

    public virtual ICollection<IdentityUserRole<string>> Roles { get; set; }
}

public class Role : IdentityRole
{
    [Required]
    public string Name { get; set; }

    public virtual ICollection<IdentityRoleClaim<string>> Claims { get; set;}
}

令人惊讶的是它还添加了一个额外的RoleId1 key to AspNetRoleClaims表和UserId1 to AspNetUserRoles表和所有 get 查询实际上使用新键而不是RoleId and UserId也存在。

不知道为什么，没有这些有用的导航属性。我想列出用户及其角色。

所以我做了以下事情：

public class ApplicationUser : IdentityUser
{
    public virtual ICollection<ApplicationUserRole> UserRoles { get; } = new List<ApplicationUserRole>();
}

public class ApplicationUserRole : IdentityUserRole<string>
{
    public virtual ApplicationUser User { get; set; }
    public virtual ApplicationRole Role { get; set; }
}

public class ApplicationRole : IdentityRole<string>
{
    public ApplicationRole(){ }

    public ApplicationRole(string roleName)
        : base(roleName)
    {
    }

    public virtual ICollection<ApplicationUserRole> UserRoles { get; } = new List<ApplicationUserRole>();
}

这会创建导航，但会创建额外的列，例如RoleId1 and Discriminator。所以，我根据以下内容添加了添加 IdentityUser POCO 导航属性.

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

    builder.Entity<ApplicationUser>()
        .HasMany(e => e.UserRoles)
        .WithOne()
        .HasForeignKey(e => e.UserId)
        .IsRequired()
        .OnDelete(DeleteBehavior.Cascade);

    builder.Entity<ApplicationUserRole>()
        .HasOne(e => e.User)
        .WithMany(e => e.UserRoles)
        .HasForeignKey(e => e.UserId);

    builder.Entity<ApplicationUserRole>()
        .HasOne(e => e.Role)
        .WithMany(e => e.UserRoles)
        .HasForeignKey(e => e.RoleId);
}

但我仍然有两列RoleId1 and Discriminator。之后，我在 ApplicationDbContext、DI 配置服务和 DB 种子中替换为新的 ApplicationRole 类。

public class ApplicationDbContext : IdentityDbContext<ApplicationUser, ApplicationRole, string, IdentityUserClaim<string>
    , ApplicationUserRole, IdentityUserLogin<string>, IdentityRoleClaim<string>, IdentityUserToken<string>>
{
    ...
}

public void ConfigureServices(IServiceCollection services)
{
   ...
   services.AddIdentity<ApplicationUser, ApplicationRole>()
            .AddEntityFrameworkStores<ApplicationDbContext>()
            .AddDefaultTokenProviders();
   ...
}

public DbInitializer(
        ApplicationDbContext context,
        UserManager<ApplicationUser> userManager,
        RoleManager<ApplicationRole> roleManager)
    {
        _context = context;
        _userManager = userManager;
        _roleManager = roleManager;
    }

public async void Initialize()
    {
        _context.Database.EnsureCreated();

        if (!_context.Roles.Any(r => r.Name == SharedConstants.Role.ADMINISTRATOR))
            await _roleManager.CreateAsync(new ApplicationRole(SharedConstants.Role.ADMINISTRATOR));
    }            

此外，我还可以导航并获取角色的名字。

ctx.Users.Select(e => new
            {
                e.Id,
                e.UserName,
                e.Email,
                e.PhoneNumber,
                Roles = e.UserRoles.Select(i => i.Role.Name).ToList()
            }).ToList();

我希望这能给你一个线索Claims导航属性。