代码:
from django.db import models # Create your models here. class Question(models.Model): question_text = models.CharField(max_length=200) pub_time = models.DateTimeField('date published') class Choice(models.Model): question = models.ForeignKey(Question) choice_text = models.CharField(max_length=200) votes = models.IntegerField(default=0)
错误:
解决办法:
将第十二行的代码改为:
question = models.ForeignKey(Question, on_delete=models.CASCADE,)
即在外键值的后面加上 on_delete=models.CASCADE