如何在Django中获取引用特定外键的记录数？

from django.db import models

class Author(models.Model):
    name = models.CharField(max_length=100)

class Book(models.Model):
    title = models.CharField(max_length=100)
    author = models.ForeignKey(Author, on_delete=models.CASCADE)

from django.db.models import Count

author_books_count = Author.objects.annotate(books_count=Count('book'))

for author in author_books_count:
    print(f"{author.name}: {author.books_count}")

John Doe: 5
Jane Smith: 3