如何在django中使用update_or_create？

obj, created = Model.objects.update_or_create(defaults=None, **kwargs)

from django.db import models

class Book(models.Model):
    title = models.CharField(max_length=100)
    author = models.CharField(max_length=100)
    publication_date = models.DateField()

# 更新现有记录或创建新记录
book, created = Book.objects.update_or_create(
    title='Django for Beginners',
    defaults={'author': 'William Vincent', 'publication_date': '2022-01-01'}
)

if created:
    print('新记录已创建')
else:
    print('现有记录已更新')

print(book.title)
print(book.author)
print(book.publication_date)