NOT NULL constraint failed: cms_viewcount.session - django

Question

I am trying to get users ip address for a blog project view counts, and when the user isn't logged in a get this error
integrityError at /article/another-post-to-test-things-out/
NOT NULL constraint failed: cms_viewcount.session
Here is my views.py
# regular blog details
def blog_detail(request, slug):
template_name = 'cms/single.html'
blog = Blog.objects.get(slug=slug)
msg = False
form = CommentForm()
ip=request.META['REMOTE_ADDR']
if not ViewCount.objects.filter(blogview=blog, session=request.session.session_key):
view=ViewCount(blogview=blog, ip_address=ip, session=request.session.session_key)
view.save()
blog_views=ViewCount.objects.filter(blogview=blog).count()
if request.user.is_authenticated:
user = request.user
if blog.likes.filter(id=user.id).exists():
msg = True
context = {'blog': blog, 'msg':msg, 'form':form, "view_count":blog_views,}
try:
if request.method == 'POST':
form = CommentForm(request.POST)
comment = form.save(commit=False)
comment.blog = blog
comment.owner = request.user
comment.save()
messages.success(request, 'Your review was successfully submitted!')
return redirect('blog-detail', slug=blog.slug)
if not request.user or not request.user.is_authenticated:
return render(request, template_name, context)
else:
return render(request, template_name, context)
except:
return render(request, "cms/login-prompt.html", context)
Here is the error on my browser also
view.save() …
Local vars
Variable Value
blog
<Blog: Another Post to test things out>
form
<CommentForm bound=False, valid=Unknown, fields=(body)>
msg
False
request
<WSGIRequest: GET '/article/another-post-to-test-things-out/'>
slug
'another-post-to-test-things-out'
template_name
'cms/single.html'
view
<ViewCount:>
PLease how can I fix this error , note everthing works fine when the user is logged in
models.py
#views count models
class ViewCount(models.Model):
blogview=models.ForeignKey(Blog, related_name="view_count", on_delete=models.CASCADE)
ip_address=models.CharField(max_length=50)
session=models.CharField(max_length=50)
def __str__(self):
return str(self.ip_address)
#comment model
class Comment(models.Model):
owner= models.ForeignKey(User, on_delete=models.CASCADE, null=True)
blog= models.ForeignKey(Blog, on_delete=models.CASCADE)
body = models.TextField(null=True, blank=True)
created = models.DateTimeField(auto_now_add=True)
id = models.UUIDField(default=uuid.uuid4, unique=True, primary_key=True,editable=False)
class Meta:
ordering = ['-created']
def __str__(self):
return str(self.blog)
forms.py if need be
#comment form
class CommentForm(forms.ModelForm):
class Meta:
model = Comment
fields = ['body']
labels = {
'body': 'Add a comment'
}
def __init__(self, *args, **kwargs):
super(CommentForm, self).__init__(*args, **kwargs)
for name, field in self.fields.items():
field.widget.attrs.update({'class': 'input'})
Here is the error again
IntegrityError at /article/another-post-to-test-things-out/
NOT NULL constraint failed: cms_viewcount.session

Answer 1

You aren't passing the required session argument in this line:
view=ViewCount(blogview=blog, ip_address=ip, session=request.session.session_key)
Since the user isn't logged in, the value is Null.
Allow the value to be Null:
`session=models.CharField(max_length=50, null = True)`
Or generate a session for an anonymous user.