是否可以在ApplicationUser类中将Roles添加为外键？

Question

I want to show all the users with their roles. I am thinking of doing something like this in the ApplicationUser class:

 public string RoleId {get; set;}
 [ForeignKey("RoleId")]
 public UserManager Role {get; set;}

Of course this doesn't return the correct results, but I think there might be a workaround...

Answer 1

The default identity schema uses a UserRoles table to associate a user's roles to them. If you implemented a custom IdentityDbContext<> you could create the foreign key relationship between your ApplicationUser , UserRole and IdentityRole implementations.

public class ApplicationUser
{
    public List<UserRole> UserRoles { get; set; }
}

public class UserRole
{
    public string UserId { get; set; }

    [ForeignKey(nameof(UserId))]
    public ApplicationUser User { get; set }

    public string RoleId { get; set; }

    [ForeignKey(nameof(RoleId))]
    public IdentityRole Role { get; set }
}

IQueryable<ApplicationUser> GetUsers(IdentityDb db)
{
    return db.Users.Include(u => u.UserRoles).ThenInclude(ur => ur.Role);
}