Django多对多插入排序

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)
    authors = models.ManyToManyField(Author, through='BookAuthor')

class BookAuthor(models.Model):
    book = models.ForeignKey(Book, on_delete=models.CASCADE)
    author = models.ForeignKey(Author, on_delete=models.CASCADE)
    order = models.IntegerField()

book1.authors.add(author1, through_defaults={'order': 1})
book1.authors.add(author2, through_defaults={'order': 2})

book_authors = BookAuthor.objects.filter(book=book1).order_by('order')