如何獲得查詢結果的另一個查詢在Django

Question

我有以下型號：

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 

我有一個過濾器，得到了客戶的所有CustomerActivities：

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

我真的需求是基於customer_activities結果的所有Activity對象嗎？

喜歡的東西

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

Answer 1

試試這個

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

瞭解更多關於lookups that span relationships