Question

我对Python和Django框架还很陌生，并且遇到了一个我找不到太多信息的问题，我目前正在关注有关django的教程： https://docs.djangoproject.com/en/2.2/intro/tutorial02/

我一直遇到此错误-

question = models.ForeignKey（Question，on_delete = models.cascade）

AttributeError：模块'django.db.models'没有属性'cascade'

我觉得有些简单的事情我没有做，并且希望得到一些帮助。

from django.db import models


class Question(models.Model):
    question_text = models.CharField(max_length=200)

    pub_date = models.DateTimeField('date published')


class Choice(models.Model):
    question = models.ForeignKey(Question, on_delete=models.cascade)

    choice_text = models.CharField(max_length=200)

    votes = models.IntegerField(default=0)

它说我应该得到：

Migrations for 'polls':
  polls/migrations/0001_initial.py:
    - Create model Choice
    - Create model Question
    - Add field question to choice

Answer 1

应为CASCADE - (Ref: Django Doc)（在大写情况下为）

question = models.ForeignKey(Question, on_delete=models.CASCADE)

因此，您的models.py成为

#models.py
from django.db import models


class Question(models.Model):
    question_text = models.CharField(max_length=200)
    pub_date = models.DateTimeField('date published')


class Choice(models.Model):
    question = models.ForeignKey(Question, on_delete=models.CASCADE)
    choice_text = models.CharField(max_length=200)
    votes = models.IntegerField(default=0)

Answer 2

您应该使用CASCADE而不是cascade

question = models.ForeignKey(Question, on_delete=models.CASCADE)

AttributeError：模块'django.db.models'没有属性'cascade'

2 个答案: