如何鏈接用戶投票的答案投票？

我正在開發一個Django項目，用戶可以詢問並回答問題。與此同時用戶可以投票答案像stackoverflow答案。現在我想鏈接用戶的答案和投票的投票數字。例如用戶A回答了一個問題，他的答案得到了10票，用戶A又回答了另一個問題並得到5票。現在這個用戶的投票應該是15. 我該怎麼做？有任何想法嗎？在此先感謝。這是我的模型：如何鏈接用戶投票的答案投票？

class Answer(models.Model): 
    user = models.ForeignKey(msignup, related_name="uanswer") 
    question = models.ForeignKey(Question) 
    description = models.TextField(max_length=2000) 
    create_date = models.DateTimeField(auto_now_add=True) 
    update_date = models.DateTimeField(auto_now=True, auto_now_add=False) 
    votes = models.IntegerField(default=0) 
    is_accepted = models.BooleanField(default=False) 
    upload = models.FileField(upload_to=upload_location, null=True, blank=True) 

class Meta: 
    verbose_name = 'Answer' 
    verbose_name_plural = 'Answers' 
    ordering = ('-is_accepted', '-votes', 'create_date',) 

def __str__(self): 
    return self.description 

def accept(self): 
    answers = Answer.objects.filter(question=self.question) 
    for answer in answers: 
     answer.is_accepted = False 
     answer.save() 
    self.is_accepted = True 
    self.save() 
    self.question.has_accepted_answer = True 
    self.question.save() 

def calculate_votes(self): 
    up_votes = Activity.objects.filter(activity_type=Activity.UP_VOTE, 
             answer=self.pk).count() 
    down_votes = Activity.objects.filter(activity_type=Activity.DOWN_VOTE, 
             answer=self.pk).count() 
    self.votes = up_votes - down_votes 
    self.save() 
    return self.votes

，這是我的看法：

def vote(request): 
    answer_id = request.POST['answer'] 
    answer = Answer.objects.get(pk=answer_id) 
    vote = request.POST['vote'] 
    userID = request.session.get('mainSession', 0) 
    user = msignup.objects.get(id=userID) 
    activity = Activity.objects.filter(
    Q(activity_type=Activity.UP_VOTE) | Q(activity_type=Activity.DOWN_VOTE), 
     user=user, answer=answer_id) 
    if activity: 
     activity.delete() 
    if vote in [Activity.UP_VOTE, Activity.DOWN_VOTE]: 
     activity = Activity(activity_type=vote, user=user, answer=answer_id) 
     activity.save() 
    return HttpResponse(answer.calculate_votes())

來源

2017-06-23 Ali AzG

您是否閱讀過[聚合主題指南]（https://docs.djangoproject.com/en/1.11/topics/db/aggregation/）？提示：總結用戶提供的所有答案的選票。 – Melvyn

謝謝。但我想爲用戶得到的所有答案總結選票。例如他的答案之一得到10，而另一個得到5，現在用戶有15票，並可以顯示在用戶配置文件部分。 –

看@ darthvader1996的答案。這就是我所說的，只有他拼寫出來。 – Melvyn

您可以查詢通過外鍵映射的所有投票給特定的用戶，然後總結他們使用django's aggregation mechanism過來：

#user_obj is an instance of the user whose votes you want to sum over 

sum_of_votes = Answer.objects.filter(user=user_obj).aggregate(Sum('votes'))

來源

2017-06-23 11:17:03

如何鏈接用戶投票的答案投票？

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