# 一对多外键增删改查

# 一对多外键增删改查
# 增
# 1 直接写实际字段 id
# models.Book.objects.create(title='论语',price=899.23,publish_id=1)
# models.Book.objects.create(title='聊斋',price=444.23,publish_id=2)
# models.Book.objects.create(title='老子',price=333.66,publish_id=1)
# 2 虚拟字段 对象
# publish_obj = models.Publish.objects.filter(pk=2).first()
# models.Book.objects.create(title='红楼梦',price=666.23,publish=publish_obj)

# 删
# models.Publish.objects.filter(pk=1).delete() # 级联删除

# 修改
# models.Book.objects.filter(pk=1).update(publish_id=2)
# publish_obj = models.Publish.objects.filter(pk=1).first()
# models.Book.objects.filter(pk=1).update(publish=publish_obj)