如何在 django 的另一个查询中获取查询结果

Question

我有以下型号：

class Activity(models.Model):
    name = models.CharField(max_length=128)
    def __unicode__(self):
        return self.name

class CustomerActivity(models.Model):
    customer = models.ForeignKey(Customer)
    activity = models.ForeignKey(Activity)
    def __unicode__(self):
        return self.activity.name

我有一个过滤器可以获取客户的所有 CustomerActivity：

customer_activities = CustomerActivity.objects.filter(customer=customer)

我真正需要的是基于 customer_activities 的结果的所有 Activity 对象？

类似

   activities = Activity.objects.filter(activity_in=customer_activities)???

Answer 1

试试这个

activities = Activity.objects.filter(customeractivity__customer=customer)

阅读更多lookups that span relationships