class TechnologyDetailView(DetailView):
 model = Technology

 def get_queryset(self):
    group_permissions =
 Permission.objects.filter(group__user=self.request.user)
    query = Technology.objects.filter(pk=self.kwargs['pk'],
 is_active=True, permission__in=group_permissions)

    for tech in query:
        comments = Comment.objects.filter(technology=tech)
        now = datetime.now()

        for comment in comments:
            comment.timestamp = datetime.strptime('Jun 1 2005 1:33PM',
 '%b %d %Y %I:%M%p')
            print(comment.timestamp)

            age = now - comment.timestamp

            if age < 604800:
                comment.is_removable = True
            else:
                comment.is_removable = False

    return query

<h3>Comments</h3>
                {% for comment in technology.comment_set.all %}
                    <div class="row" style="border-bottom-style:solid;
 border-bottom-width:1px; border-color:gray;">
                        <h6 style="font-weight:bold">Written by {{
 comment.user.name }}
                            on {{ comment.timestamp }}</h6>
                        <span>{{ comment.content|breaks }}</span>
                            <p>{{ comment.timestamp | timesince }}</p>


                        {% if comment.user == request.user %}
                            <a class="modal-trigger right"
 href="#modal_{{ comment.pk }}">Delete Comment</a>
                        {% endif %}
                     <div id="modal_{{ comment.pk  }}" class="modal">
                                <div class="modal-content">
                                    <iframe frameborder="0"
 id="encoder_iframe" height=300px width="100%" src="{% url 'delete-
 comment' comment.pk %}"></iframe>
                                </div>
                            </div>
                    </div>
                {% empty %}
                    <p>There are no comments</p>
                {% endfor %}
                <br>
                <h5>Add new Comment</h5>
                <iframe frameborder="0" id="encoder_iframe"
height=300px width="100%" src="{% url 'add-comment' technology.pk %}">
</iframe>
            </div>
        </div>
    </div>

# Comment model
class Comment(models.Model):
user = models.ForeignKey(User, null=True)
technology = models.ForeignKey(Technology, null=True)
parent = models.ForeignKey('self', null=True, blank=True)
content = models.TextField(null=True)
timestamp = models.DateTimeField(null=True)
is_active = models.BooleanField(default=True)