Django-如何添加評論限制為1

我目前有評論功能，我想為每個用戶添加一條評論的限制，但不知道該怎么做。我堅持在用戶模型中創建一個“已發布”欄位，當用戶發布評論時這是正確的，但我不知道該怎么做，最重要的是，這是否是更好的方法......

class Comment(models.Model):
    service = models.ForeignKey(Product, on_delete=models.CASCADE, blank=True, null=True, related_name='comments')
    author = models.ForeignKey(User, on_delete=models.CASCADE, blank=True, null=True,)

    content = models.CharField(max_length=200, null=False, blank=True)
    date = models.DateTimeField(auto_now_add=True)

    def get_absolute_url(self):
        return reverse('product-feedback', kwargs={'pk': self.pk})

class ProductFeedbackView(DetailView):
    model = Product
    template_name = 'services/product-feedback.html'

    def get_context_data(self , **kwargs):
        data = super().get_context_data(**kwargs)
        connected_comments = Comment.objects.filter(service=self.get_object())
        number_of_comments = connected_comments.count()
        data['comments'] = connected_comments
        data['no_of_comments'] = number_of_comments
        data['comment_form'] = CommentForm()
        return data

    def post(self , request , *args , **kwargs):
        if self.request.method == 'POST':
            comment_form = CommentForm(self.request.POST)
            if comment_form.is_valid():
                content = comment_form.cleaned_data['content']

            new_comment = Comment(content=content, author=self.request.user , service=self.get_object())
            new_comment.save()
            return redirect(self.request.path_info)

{% block content %}

    {% if user.is_authenticated %}
        <form action="" method="POST" id="main_form" class="comment_form">
            <div>
                <label for="comment">Type Comment here</label>
                {{ comment_form.content }} {% csrf_token %} <input type="submit" value="Post"></div>
            </div>
        </form>
        {% else %}
            <h2>You need to Login to comment</h2> 
        {% endif %}

        {% for comment in comments %}
            <h3> <b>{{ comment.author }} : </b> {{ comment.content }}</h3> 
        {% endfor %}

{% endblock content %}

uj5u.com熱心網友回復：

如果您確實確定用戶應該發布一條且僅一條評論，則應使用 OneToOneField。這樣就可以自動生成唯一性約束，使物件更易于管理。

class Comment(models.Model):
    service = models.ForeignKey(Product, on_delete=models.CASCADE, blank=True, null=True, related_name='comments')
    author = models.OneToOneField(User, on_delete=models.CASCADE, blank=True, null=True,)
    content = models.CharField(max_length=200, null=False, blank=True)

如果您希望用戶對每個產品只發表一條評論，但仍允許他對任意數量的產品發表評論，您應該在 Meta 類中添加一個約束：

class Comment(models.Model):
    service = models.ForeignKey(Product, on_delete=models.CASCADE, blank=True, null=True, related_name='comments')
    author = models.ForeignKey(User, on_delete=models.CASCADE, blank=True, null=True,)
    content = models.CharField(max_length=200, null=False, blank=True)

    class Meta:
        constraints = [
            models.UniqueConstraint(fields=["service", "author"], name="One comment per user per product")
        ]

標籤：Pythondjangodjango-views

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