Adding related data to 2 tables Yii2. How to implement?

Question

Yii

There are 3 tables:
user
id | username
books_categories
id | category_name
user_books
id | user_id | category_id | book_name
When adding a value to the User model, it is also necessary to fill in UserBooks.
In the view, I display something like this (let's say that you always need to add 2 books):

<input type="text" name="User[username]" />
<input type="text" name="User[book_name][1]" />
<input type="text" name="User[book_name][2]" />

where 1 and 2 are id from books_categories
Thanks in advance.

Answer 1

Through a link. And generally it is simple in transaction. In case you didn't, write the connections in the models.