IntegrityError: NOT NULL constraint failed

I try to let user add comments to blog post am making... When I run makemigrations and migrate, everything seemed fine . The form displayed well but shows the following error when I fill the form and click on the submit button. Django.db.utils.IntegrityError: NOT NULL constraint failed: blog_comment.author_id

Am new to Django and following a tutorial. The tutorial doesn't have users except the super user. I learnt about users and so I let user register to use the blog. The tutorial provided a name field in the form so commenter can enter their name. Here, I want to use the current user for this field(see my models.py below to see how I have done this). Any help to solve this will be appreciated.

PS: I have seen similar questions like this and deleted my migrations file and re-ran migrations but it didn't still work.

#models.py
class Comment(models.Model):
post = models.ForeignKey(Post, on_delete=models.CASCADE, related_name='comments')
author = models.ForeignKey(get_user_model(), on_delete=models.CASCADE,)
comment = models.TextField()
created = models.DateTimeField(auto_now_add=True)
updated = models.DateTimeField(auto_now=True)
active = models.BooleanField(default=True)

class Meta:
ordering = ('created',)

def __str__(self):
return f'Comment by {self.author} on {self.post}'

#forms.py
class CommentForm(forms.ModelForm):

class Meta:
model = Comment
fields = ('comment',)

#views.py
login_required
def post_detail(request, post, pk):
post = get_object_or_404(Post, id=pk, slug=post, status='published')
comments = post.comments.filter(active=True)
new_comment = None

if request.method == 'POST':
comment_form = CommentForm(data=request.POST)
if comment_form.is_valid():
new_comment = comment_form.save(commit=False)
new_comment.post = post
new_comment.save()
else:
comment_form = CommentForm()
return render(request,
'post_detail.html',
{'post': post,
'comments': comments,
'new_comment': new_comment,
'comment_form': comment_form})

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