一对多外键增删改查

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# 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)