将ASP.NET身份用户链接到Books表

Question

I've used the default WebApi template with Individual Authorization for my project. I've successfully registered accounts, and edited the model and controller so that the UserName is stored in the Username field instead of the email, which is how it is by default.

I am trying to create a Book table with the following model :

public int Id { get; set; }
[Required]
public string Title { get; set; }
public string Description { get; set; }
public int Ratings { get; set; }

// Foreign Key
public string Username { get; set; }
// Navigation property
public Guid Guid { get; set; }

I want to use the UserName as the foreign key since it is unique. Can anyone tell me if this is correct. I'm not sure the navigation property.

Answer 1

For having a Foreign Key, the standard examples say that you should have something like this:

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

This allows you to use UserId as the Foreign Key , at the same time the entire User object is lazily available to you. You could use this property to access the Book.User.Username in your code.

It makes little sense to have a column containing the the actual Username s. Tomorrow, if you wish to have the user's Email , you will have to add another column in your Books table. But with the above example, you merely need to access Book.User.Email in the code.

(Tip: Using the Id column is fast is it is the PK in the Foreign table and hence Indexed .)

(Tip2: Avoid Guid as the type for Id column. Personally, I use `long, which is more efficient with respect to indexing and has a reasonable range)