# models.py
class Task(models.Model):
    details = models.ForeignKey(Details)
    task = models.CharField(max_length=1024)

class Activity(models.Model):
    task = models.ForeignKey(Task)
    activity = models.CharField(max_length=1024)

class Resources(models.Model):
    activity = models.ForeignKey(Task)
    resources = models.CharField (max_length=1024)

# forms.py
class ViewTable(tables.Table):
    task = tables.Column(default=' ')
    activity = tables.Column(default=' ')
    resource = tables.Column(default=' ')

# views.py
table = None
for task in tasks:
    if table:
        table = list(chain(table, task)
    else:
        table = task

    for activity in Activities.objects.filter(tasks=task):
        table = list(chain(table, activity))
        for resource in Resources.objects.filter(activity=activity):
            table = list(chain(table, resource))

return render(request, 'table.html', {'table', table, })


# table.html
<table>
    <tr>
        <th>Tasks</th>
        <th>Activity</th>
        <th>Resources</th>
    </tr>
{% for item in table %}
    <tr>
        <th>{{ item.task }}</th>
        <th>{{ item.activity }}</th>
        <th>{{ item.resource }}</th>
    </tr>
{% endfor %}
</table>