具有多种功能的用户的数据库模型

Question

在another question中，我解释了在ASP.Net MVC 5网站中创建具有不同功能的2种不同类型用户的目标。我想知道如何修改我当前的数据库模型以根据其类型保存相关信息。我目前的模型如下：

public class User : IUser
{
    public User()
        : this(String.Empty)
    {
    }

    public User(string userName)
    {
        UserName = userName;
        Id = Guid.NewGuid().ToString();
    }

    [Key]
    public string Id { get; set; }

    [Required]
    public string UserName { get; set; }

    [Required]
    public string FirstName { get; set; }

    [Required]
    public string LastName { get; set; }

    public string Phone { get; set; }
    public string MobilePhone { get; set; }

    [Required]
    [DataType(DataType.EmailAddress)]
    public string Email { get; set; }

    public virtual IList<UserAddress> Addresses { get; set; }
}

public class Restaurant
{
    [Key]
    public int ID { get; set; }

    [Required]
    public string Name { get; set; }

    public virtual IList<RestaurantAddress> Addresses { get; set; }

    public virtual IList<RestaurantFood> Menu { get; set; }

    public virtual IList<Review> Reviews { get; set; }

    [DataType(DataType.Url)]
    public string Website { get; set; }

    [DataType(DataType.PhoneNumber)]
    public string Phone { get; set; }

    [DataType(DataType.PhoneNumber)]
    public string Fax { get; set; }

    [DataType(DataType.EmailAddress)]
    public string Email { get; set; }

    public int Seats { get; set; }

    public double AverageRating { get; set; }
    public double AveragePrice { get; set; }
}

我想到的一个解决方案是将User类的附加信息移动到另一个类，并在基本用户信息类中保存相关模型的外键。类似的东西：

public class User : IUser
{
    public User()
        : this(String.Empty)
    {
    }

    public User(string userName)
    {
        UserName = userName;
        Id = Guid.NewGuid().ToString();
    }

    [Key]
    public string Id { get; set; }

    [Required]
    public string UserName { get; set; }

    public virtual ExtendedUser NormalUserInfo { get; set; }
    public virtual Restaurant RestaurantInfo { get; set; }
}

public class ExtendedUser
{
    [Required]
    public string FirstName { get; set; }

    [Required]
    public string LastName { get; set; }

    public string Phone { get; set; }
    public string MobilePhone { get; set; }

    [Required]
    [DataType(DataType.EmailAddress)]
    public string Email { get; set; }

    public virtual IList<UserAddress> Addresses { get; set; }
}

public class Restaurant
{
    [Key]
    public int ID { get; set; }

    [Required]
    public string Name { get; set; }

    public virtual IList<RestaurantAddress> Addresses { get; set; }

    public virtual IList<RestaurantFood> Menu { get; set; }

    public virtual IList<Review> Reviews { get; set; }

    [DataType(DataType.Url)]
    public string Website { get; set; }

    [DataType(DataType.PhoneNumber)]
    public string Phone { get; set; }

    [DataType(DataType.PhoneNumber)]
    public string Fax { get; set; }

    [DataType(DataType.EmailAddress)]
    public string Email { get; set; }

    public int Seats { get; set; }

    public double AverageRating { get; set; }
    public double AveragePrice { get; set; }
}

并在控制器中：

    User user = BuildUser();
    ExtendedUser normal = BuildNormalUser();
    Restaurant rest = BuildRestaurant();
    if (model.Type == UserType.NormalUser)
        user.NormalUserInfo = normal;
    else
        user.RestaurantInfo = normal;

但是，我不确定这是否正确。