無法在Django視圖中創建對象

Question

我想在視圖中創建對象，但無法弄清楚爲什麼我會得到500錯誤。

下面是相關代碼：

lvt = LastVisitedTopic.objects.create(user=uid, topic=t.id, lastvisited=lv) 

和模型是：

class LastVisitedTopic(models.Model): 
    user = models.ForeignKey(User) 
    topic = models.ForeignKey(Topic) 
    lastvisited = models.DateTimeField(auto_now=True) 
    class Meta: 
    managed = True  
    app_label = 'myforum' 

傳遞給create方法的參數似乎是確定：

print 'uid, t.id, lv \n', uid, t.id, lv 

產量：

uid, t.id, lv 
1 202798 2014-10-19 03:10:00+00:00 

我在這個股票一段時間，所以真的很感激你的線索。

UPDATE： 這裏是整個意見，在情況下，它可以幫助：

def notify_ajax(request): 
    #if request.method == 'GET': 
     args = {} 
     alerts = [] 
     mt_alerts = [] 
     uid = request.user.id 
     numalerts = 0 

     if Topic.objects.filter(Q(post__creator_id=uid) | Q(creator_id=uid)).exists(): 
      mypartopics = Topic.objects.filter(Q(post__creator_id=uid) | Q(creator_id=uid)).distinct().order_by("-created") 
      for t in mypartopics: 
       print t.title 
       #Check whether there is record of the topic in LastVisitedTopic 
       if not LastVisitedTopic.objects.filter(topic_id=t.id, user_id=uid).exists(): 
        print 'LastVisitedTopic not exists so to be created...' 
        #Calculate the record 
        #If topic has posts by this user 
        if Post.objects.filter(topic_id=t.id, creator_id=uid).exists(): 
         print 'this topic has posts...\n' 
        #Last post time by this user is assumed as the last time he visited the topic 
         last_post = Post.objects.filter(topic_id=t.id, creator_id=uid).latest('created') 
         print 'latest post found' 
         lv = last_post.created 
         print 'lv to be added from post', lv 
         print 'uid, t.id, lv \n', uid, t.id, lv 
         lvt = LastVisitedTopic.objects.create(user=uid, topic=t.id, lastvisited=lv) 
         print 'last visit record created'     
        #Else last visit is assumed as the time when the topic is created 
        else: 
         lv = t.created 
         print 'lv added from topic' 


         lvt = LastVisitedTopic.objects.create(user=uid,topic=t.id, lastvisited='%s') 


         print 'last visit record created equal to topic creation time'     



       else: 
        print 'record for this topic exists', 
        track = LastVisitedTopic.objects.get(topic_id=t.id, user_id=uid) 
        print 'last visited at', track.lastvisited 

       #Check whether the topic lastposted field is not empty, if so, fill it 
       if not t.lastposted: 
        if Post.objects.filter(topic_id=t.id).exists(): 
         topic_lp= Post.objects.filter(topic_id=t.id).latest('created') 
         t.lastposted = topic_lp.created 
         t.save() 
         print 'new t.lastposted saved' 
        else: 
         t.lastposted = t.created 
         t.save() 
       else: 
        print 't.lastposted for this topic exists', t.lastposted 




       #Now compare last visit by the user with last topic post 
       try: 
        print '\n\n\nnow trying...' 
        track = LastVisitedTopic.objects.get(topic_id=t.id, user_id=uid) 
        print 'track', track.id 
        last_visit = track.lastvisited 
        print 'last visit', last_visit 
        print 't.lastposted', t.lastposted 

        if t.lastposted > last_visit : 
         print 'topic posted after the last visit' 
         #last_posts = Post.objects.filter(topic_id=t.id).latest() 
         #if last_post.created >= last_visit: 
         alerts.append({'title':t.title, 'slug':t.slug}) 
        else: 
         print 'lastposted before last visit' 
       except: 
        print 't excpeton' 
        pass 

      print 'alerts', alerts 
      print 'alerst length', len(alerts) 
      args['alerts'] = alerts 
      return render(request, '_alerts.html', args) 

Answer 1

像錯誤說，你需要一個實際的用戶，而不是ID。您可以直接通過request.user。你可能會得到相同的話題錯誤;再次，你應該只是傳遞對象本身。

LastVisitedTopic.objects.create(user=request.user, topic=t, lastvisited=lv)