在Django QuerySet的所有数据中插入字典

from django.db import models

class Book(models.Model):
    title = models.CharField(max_length=200)
    author = models.CharField(max_length=100)

# 获取所有书籍的QuerySet
books = Book.objects.all()

# 创建一个字典，包含要添加的信息
extra_info = {'publisher': 'Unknown', 'year': 2023}

# 使用列表推导式为每个书籍对象添加额外信息
books_with_info = [{'book': book, **extra_info} for book in books]

# 打印结果
for item in books_with_info:
    print(item)

# 假设你想将所有书籍的出版年份更新为2023
Book.objects.update(year=2023)

# 在Book模型中添加新的字段
class Book(models.Model):
    title = models.CharField(max_length=200)
    author = models.CharField(max_length=100)
    publisher = models.CharField(max_length=200, default='Unknown')

# 进行数据库迁移
python manage.py makemigrations
python manage.py migrate

# 更新所有书籍的出版商信息
Book.objects.update(publisher='New Publisher')