Django UNIQUE constraint failed: players_comment.user_id - django

Question

I'm trying to post comment but it's not getting posted, rather this error is appearing UNIQUE constraint failed: players_comment.user_id. I don't know why this error is occuring.
My forms.py:
class CommentForm(forms.ModelForm):
class Meta:
model = Comment
fields = ('body', 'transfernews')
My models.py :
class Transfernews(models.Model):
player_name = models.CharField(max_length=255)
player_image = models.CharField(max_length=2083)
player_description = models.CharField(max_length=3000)
date_posted = models.DateTimeField(default=timezone.now)
class Comment(models.Model):
user = models.OneToOneField(User, on_delete=models.CASCADE)
transfernews = models.ForeignKey(Transfernews, related_name="comments", on_delete=models.CASCADE)
body = models.TextField()
date_added = models.DateTimeField(auto_now_add=True)
def __str__(self):
return '%s - %s' % (self.transfernews.player_name, self.user.username)
My views.py:
def transfer_targets(request):
transfernews = Transfernews.objects.all()
form = CommentForm(request.POST or None)
if form.is_valid():
new_comment = form.save(commit=False)
new_comment.user = request.user
new_comment.save()
return redirect('transfernews/')
return render(request, 'transfernews.html', {'transfernews': transfernews, 'form': form})
My transfernews.html:
{% for transfer in transfernews %}
{% if not transfer.comments.all %}
No comments Yet...
{% else %}
{% for comment in transfer.comments.all %}
<strong>
{{ comment.user.username }} - {{ comment.date_added }}
</strong>
<br/>
{{ comment.body }}
<br/><br/>
{% endfor %}
{% endif %}
<hr>
<div>Comment and let us know your thoughts</div>
<form method="POST">
{% csrf_token %}
{{ form|crispy }}
<button class="btn btn-primary btn-sm shadow-none" type="submit">Post comment</button>
<button class="btn btn-outline-primary btn-sm ml-1 shadow-none" type="button">Cancel</button>
</form>
{% endfor %}

Answer 1

In models.py, in the comment class, change
user = models.OneToOneField(User, on_delete=models.CASCADE)
to
user = models.ForeignKey(to=User, on_delete=models.CASCADE)
One to one works both ways, user's allowed to only have one comment and a comment can belong to only one user. By changing to one to many via foreignkey you'll preserve the latter and get rid of the former constraint.