如何解决FOREIGN KEY约束失败，为什么出现此错误？
我正在创建一个博客，现在我在注释部分中工作，在编辑注释中工作，一切正常，但是问题出在下面，每当我更新要重定向的视图时我对博客文章发表了评论，但是每当我这样做时，都会收到标题中的错误，这是代码：
models.py
在这里，我想以与在Post Model中相同的方式进行重定向，该模型将重定向到文章详细信息
class Post(models.Model):
title = models.CharField(max_length= 255)
header_image = models.ImageField(null = True,blank = True,upload_to = 'images/')
author = models.ForeignKey(User,on_delete=models.CASCADE)
body = RichTextField(blank = True,null = True)
#body = models.TextField()
post_date = models.DateField(auto_now_add=True)
category = models.CharField(max_length=255,default='coding')
snippet = models.CharField(max_length=255)
likes = models.ManyToManyField(User,related_name = 'blog_posts')
def total_likes(self):
return self.likes.count()
def __str__(self):
return self.title + ' | ' + str(self.author)
def get_absolute_url(self):
return reverse('app1:article-detail',args=(self.id,))
class Comment(models.Model):
post = models.ForeignKey(Post,related_name="comments",on_delete=models.CASCADE)
name = models.ForeignKey(User,on_delete=models.CASCADE)
body = models.TextField()
date_added = models.DateTimeField(auto_now_add=True)
def __str__(self):
return '%s - %s' % (self.post.title,self.name)
def get_absolute_url(self):
return reverse('app1:article-detail',))
views.py
在这两个视图中，是否要重定向到存储所有评论的文章详细信息，这与发布相同，但它显示了一个错误
class AddCommentView(CreateView):
model = Comment
form_class = CommentForm
template_name = 'app1/add_comment.html'
def form_valid(self,form):
form.instance.post_id = self.kwargs['pk']
form.instance.name = self.request.user
return super().form_valid(form)
#fields = '__all__'
success_url = reverse_lazy('index')
class UpdateCommentView(UpdateView):
model = Comment
template_name = 'app1/update_comment.html'
form_class = CommentForm
def form_valid(self,form):
form.instance.post_id = self.kwargs['pk']
form.instance.name = self.request.user
return super().form_valid(form)
回溯
Traceback (most recent call last):
File "C:\Users\snin2\anaconda3\envs\MyDjangoEnv\lib\site-packages\django\db\backends\utils.py",line 86,in _execute
return self.cursor.execute(sql,params)
File "C:\Users\snin2\anaconda3\envs\MyDjangoEnv\lib\site-packages\django\db\backends\sqlite3\base.py",line 396,in execute
return Database.Cursor.execute(self,query,params)
sqlite3.IntegrityError: FOREIGN KEY constraint failed
The above exception was the direct cause of the following exception:
Traceback (most recent call last):
File "C:\Users\snin2\anaconda3\envs\MyDjangoEnv\lib\site-packages\django\core\handlers\exception.py",line 34,in inner
response = get_response(request)
File "C:\Users\snin2\anaconda3\envs\MyDjangoEnv\lib\site-packages\django\core\handlers\base.py",line 115,in _get_response
response = self.process_exception_by_middleware(e,request)
File "C:\Users\snin2\anaconda3\envs\MyDjangoEnv\lib\site-packages\django\core\handlers\base.py",line 113,in _get_response
response = wrapped_callback(request,*callback_args,**callback_kwargs)
File "C:\Users\snin2\anaconda3\envs\MyDjangoEnv\lib\site-packages\django\views\generic\base.py",line 71,in view
return self.dispatch(request,*args,**kwargs)
File "C:\Users\snin2\anaconda3\envs\MyDjangoEnv\lib\site-packages\django\views\generic\base.py",line 97,in dispatch
return handler(request,**kwargs)
File "C:\Users\snin2\anaconda3\envs\MyDjangoEnv\lib\site-packages\django\views\generic\edit.py",line 194,in post
return super().post(request,line 142,in post
return self.form_valid(form)
File "C:\Users\snin2\Desktop\basura\lapagina\app1\views.py",line 24,in form_valid
return super().form_valid(form)
File "C:\Users\snin2\anaconda3\envs\MyDjangoEnv\lib\site-packages\django\views\generic\edit.py",line 125,in form_valid
self.object = form.save()
File "C:\Users\snin2\anaconda3\envs\MyDjangoEnv\lib\site-packages\django\forms\models.py",line 459,in save
self.instance.save()
File "C:\Users\snin2\anaconda3\envs\MyDjangoEnv\lib\site-packages\django\db\models\base.py",line 745,in save
self.save_base(using=using,force_insert=force_insert,File "C:\Users\snin2\anaconda3\envs\MyDjangoEnv\lib\site-packages\django\db\models\base.py",line 782,in save_base
updated = self._save_table(
File "C:\Users\snin2\anaconda3\envs\MyDjangoEnv\lib\site-packages\django\db\models\base.py",line 864,in _save_table
updated = self._do_update(base_qs,using,pk_val,values,update_fields,line 917,in _do_update
return filtered._update(values) > 0
File "C:\Users\snin2\anaconda3\envs\MyDjangoEnv\lib\site-packages\django\db\models\query.py",line 771,in _update
return query.get_compiler(self.db).execute_sql(CURSOR)
File "C:\Users\snin2\anaconda3\envs\MyDjangoEnv\lib\site-packages\django\db\models\sql\compiler.py",line 1492,in execute_sql
cursor = super().execute_sql(result_type)
File "C:\Users\snin2\anaconda3\envs\MyDjangoEnv\lib\site-packages\django\db\models\sql\compiler.py",line 1144,in execute_sql
cursor.execute(sql,params)
File "C:\Users\snin2\anaconda3\envs\MyDjangoEnv\lib\site-packages\django\db\backends\utils.py",line 100,in execute
return super().execute(sql,line 68,in execute
return self._execute_with_wrappers(sql,params,many=False,executor=self._execute)
File "C:\Users\snin2\anaconda3\envs\MyDjangoEnv\lib\site-packages\django\db\backends\utils.py",line 77,in _execute_with_wrappers
return executor(sql,many,context)
File "C:\Users\snin2\anaconda3\envs\MyDjangoEnv\lib\site-packages\django\db\backends\utils.py",params)
File "C:\Users\snin2\anaconda3\envs\MyDjangoEnv\lib\site-packages\django\db\utils.py",line 90,in __exit__
raise dj_exc_value.with_traceback(traceback) from exc_value
File "C:\Users\snin2\anaconda3\envs\MyDjangoEnv\lib\site-packages\django\db\backends\utils.py",params)
django.db.utils.IntegrityError: FOREIGN KEY constraint failed
[10/Aug/2020 16:15:21] "POST /app1/update_comment/10 HTTP/1.1" 500 179169
解决方法
如果您直接从数据库或管理站点中删除了任何信息，则那里可能会发生错误。
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