NOT NULL約束失敗：news_comment.post_id

我反彈到這個錯誤。我Models.py文件NOT NULL約束失敗：news_comment.post_id

class Post(models.Model): 
    user = models.ForeignKey(User,related_name='posts') 
    created_at = models.DateTimeField(auto_now=True) 
    message = models.TextField() 
    message_html = models.TextField(editable=False) 

    def __str__(self): 
     return self.message 

    def save(self,*args,**kwargs): 
     self.message_html = misaka.html(self.message) 
     super().save(*args,**kwargs) 

    def get_absolute_url(self): 
     return reverse('news:single',kwargs={'username':self.user.username,'pk':self.pk}) 

    class Meta(): 
     ordering = ['-created_at'] 

class Comment(models.Model): 
    post = models.ForeignKey('news.Post',related_name='comments') 
    aurthor = models.CharField(blank=False, max_length=100) 
    comment = models.TextField(blank=True) 
    created_date = models.DateTimeField(auto_now = True) 
    comment_html = models.TextField(editable = False) 

    def save(self,*args,**kwargs): 
     self.comment_html = misaka.html(self.comment) 
     super().save(*args,**kwargs) 

    def get_absolute_url(self): 
     return reverse('news:single',kwargs={'username':self.user.username,'pk':self.pk}) 

    def __str__(self): 
     return self.comment

和我Views.py文件

class CommentCreateView(LoginRequiredMixin,generic.CreateView): 
    model = models.Comment 
    fields = ('comment',) 

    login_url = "https://stackoverflow.com/users/login" 

    def form_valid(self,form,*args,**kwargs): 
     self.object = form.save(commit = False) 
     self.object.aurthor = self.request.user 
     #self.object.post_id = self.kwargs['pk'] 
     #print(self.request,self.kwargs['pk']) 
     self.object.save() 
     return super().form_valid(form)

而我得到的錯誤是

IntegrityError at /posts/4/comment/ 
NOT NULL constraint failed: news_comment.post_id 
Request Method: POST 
Request URL: http://localhost:8000/posts/4/comment/ 
Django Version: 1.11.3 
Exception Type: IntegrityError 
Exception Value:  
NOT NULL constraint failed: news_comment.post_id 
Exception Location: C:\Users\Sahil\AppData\Local\Programs\Python\Python36-32\lib\site-packages\django\db\backends\sqlite3\base.py in execute, line 328 
Python Executable: C:\Users\Sahil\AppData\Local\Programs\Python\Python36-32\python.exe 
Python Version: 3.6.0 
Python Path:  
['C:\\Users\\Sahil\\Documents\\GitHub\\news-for-good\\my_app', 
'C:\\Users\\Sahil\\AppData\\Local\\Programs\\Python\\Python36-32\\python36.zip', 
'C:\\Users\\Sahil\\AppData\\Local\\Programs\\Python\\Python36-32\\DLLs', 
'C:\\Users\\Sahil\\AppData\\Local\\Programs\\Python\\Python36-32\\lib', 
'C:\\Users\\Sahil\\AppData\\Local\\Programs\\Python\\Python36-32', 
'C:\\Users\\Sahil\\AppData\\Local\\Programs\\Python\\Python36-32\\lib\\site-packages'] 
Server time: Tue, 25 Jul 2017 16:21:26 +0000

誰能請告訴錯誤是什麼。

如果您需要的代碼的其餘部分提前This My Github Repo

謝謝... 謝謝:)

來源

2017-07-25 Sahil Mangotra

你已經忘了在視圖中添加後foreignkey場保存。因爲你沒有定義null=True後foreignkey字段評論模型。所以你需要分配後模型實例當你保存評論模型實例

def form_valid(self,form,*args,**kwargs): 
     self.object = form.save(commit = False) 
     self.object.aurthor = self.request.user 
     self.object.post = # Assign Post model instance 
     self.object.save() 
     return super().form_valid(form)

來源

2017-07-25 16:40:09

NOT NULL約束失敗：news_comment.post_id

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