http://127.0.0.1:8000/boards/1/

python manage.py migrate

#boards/models.py
class Topic(models.Model):
    views = models.PositiveIntegerField(default=0) # <- here
    

python manage.py makemigrations
python manage.py migrate


#boards/views.py 

def topic_posts(request, pk, topic_pk):
    topic = get_object_or_404(Topic, 
 
board__pk=pk, pk=topic_pk)
    topic.views += 1
    topic.save()
    return render(request, ‘topic_posts.html‘, {‘topic‘: topic})

<!--templates/topics.html-->
{% for topic in topics %}
    <tr>
        <td><a href="{% url ‘topic_posts‘ board.pk topic.pk %}">{{ topic.subject }}</
 
a></td>
        <td>{{ topic.starter.username }}</td>
        <td>{{ topic.replies }}</td>
        <td>{{ topic.views }}</td> <!-- here -->
        <td>{{ topic.last_updated }}</td>
    </tr>
{% endfor %}

Django入門與實踐-第21章：遷移（完結）