使用详细视图在django模板中显示数据

我在DetailView模板上显示数据时遇到问题,基本上我想显示一个项目区域和任务的所有数据,我的模型就是这样

##models    
class Project(models.Model):
        name = models.CharField(max_length=100)
        ...


    class Area(models.Model):
        name = models.CharField(max_length=100)
        project = models.ForeignKey(Project ,on_delete=models.CASCADE,  related_name='areas' )

    class Task(models.Model):
        ....
        area = models.ForeignKey(Area ,on_delete=models.CASCADE,  related_name='tasks' )

#view 
class ProjectDetailView(DetailView):
    model = Project
    template_name = 'project-detail.html'

这最终在模板中起作用

{% for area in object.areas.all %}
    {{area}}<br />
    {% for t in area.tasks.all %}
     {{ t }}<br />
     {% endfor %}
     <hr/>
{% endfor %}