this__all

У меня получилось вот так

<?php
namespace app\controllers;
use yii\web\Controller;
use yii\data\Pagination;
use app\models\Book;
use app\models\Author;

class SortController extends Controller {
  public function actionSort() {
    $years = Book::find()
      ->where('year>=1901')
      ->all();
      
    $books = Book::find()->all();

    $books = $books->select('author.name as author, COUNT(*) AS quantity')
      ->form('book')
      ->joinWith('author on book.id_author = author.id_author')
      ->groupBy('author.id_author');

    var_dump($books);

    return $this->render('sort', [
      'years' => $years,
      'books' => $books,
    ]);
  }
}

Но выдаёт ошибку "all to a member function select() on array" вот в этой строчки

$books = $books->select('author.name as author, COUNT(*) AS quantity')