int（）的基数为10的无效文字：'a'

Question

我正在尝试为django中的帖子创建评论模型。我想打印用户名和评论。

这是我的评论模型

class Comment(models.Model):
    item = models.ForeignKey('app.Item', related_name='comments')
    user = models.ForeignKey('auth.User', blank=True, null=True)
    text = models.TextField()
    created_date = models.DateTimeField(default=timezone.now)
    approved_comment = models.BooleanField(default=False)

    def approve(self):
        self.approved_comment = True
        self.save()

    def __str__(self):
        return self.text

这是我的观点

def add_comment_to_post(request, pk):
    item = get_object_or_404(Item, pk=pk)
    if request.method == "POST":
        form = CommentForm(request.POST)
        if form.is_valid():
            comment = form.save(commit=False)
            comment.user = user.username
            comment.item = item
            comment.save()
            return redirect('item_detail', pk=item.pk)
    else:
        form = CommentForm()
    return render(request, 'app/add_comment_to_post.html', {'form': form}

）

这是我的HTML代码

{% for comment in item.comments.all %}
    {% if user.is_authenticated or comment.approved_comment %}
    <div class="comment">
        <div class="date">
            {{ comment.created_date }}
            {% if not comment.approved_comment %}
                <a class="btn btn-default" href="{% url 'comment_remove' pk=comment.pk %}"><span class="glyphicon glyphicon-remove"></span></a>
                <a class="btn btn-default" href="{% url 'comment_approve' pk=comment.pk %}"><span class="glyphicon glyphicon-ok"></span></a>
            {% endif %}
        </div>
        <p> {{comment.user}} <p>
        <p>{{ comment.text|linebreaks }}</p>
    </div>
    {% endif %}
{% empty %}
    <p>No comments here yet :(</p>
{% endfor %}