未更新的模型字段

我想將Facebook訂閱源添加到我的網站（僅限第一條最新的留言信息）。所以我創建了這個模型：未更新的模型字段

class FacebookFeed(models.Model): 
    checked = models.DateTimeField(name="Time Checked", auto_now_add=True) 
    message = models.TextField(name="Message", null=True) 
    author = models.CharField(name="Author", max_length=50) 
    date = models.DateTimeField(name="Post time", null=True) 

    def save(self, *args, **kwargs): 
     queryset = FacebookFeed.objects.all() 
     if(queryset): 
      return 
     else: 
      #super(FacebookFeed, self).save() 
      super(FacebookFeed, self).save(*args, **kwargs) 

    def check_time(self): 
     if self.checked: 
      now = datetime.utcnow() 
      diff = now - self.checked 
      if diff.seconds >= 3600: 
       return True 
     return False

我想每個整小時只執行一次feed更新，所以這就是check_time方法的作用。現在，我認爲正在使用的功能：

def getSocialFeed(): 
    #facebook 
    fb = FacebookFeed.objects.all() 
    created = False 
    if not fb: 
     logging.debug('not fb') 
     f = FacebookFeed(); 
     f.save() 
     created = True 
    fb = FacebookFeed.objects.all()[0] 

    if fb.check_time() or created: 
     logging.debug('check time true') 
     conn = httplib.HTTPSConnection("graph.facebook.com") 
     conn.request("GET", '/UserName/feed') 
     r = conn.getresponse() 
     jsonResult = r.read() 
     json = simplejson.loads(jsonResult) 
     json = json['data'] 

     notAuthor = False 
     i = 0 
     if json: 
      logging.debug('json') 
      while notAuthor is not True: 
       logging.debug('while') 
       if json[i]['from']['name'] == 'UserName': 
        logging.debug('result %s' % (json[i]['from']['name'] == 'UserName')) 
        logging.debug('message: %s' % json[i]['message']) 
        date = json[i]['created_time'].replace('T', ' ') 
        logging.debug('date: %s' % date) 
        date = date[0:-5] 
        logging.debug('date2: %s' % date) 
        logging.debug('fb: %s' % fb) 
        fb.message = json[i]['message'] 
        fb.date = datetime.strptime(date, "%Y-%m-%d %H:%M:%S") 
        fb.author = 'UserName'      
        try: 
         x = fb.save() 
         logging.debug('x: %s' % x) 
         notAuthor = True 
         logging.debug(fb.message) 
         logging.debug(notAuthor) 
        except Exception, e: 
         logging.debug('e: %s' % e) 
       else: 
        i+=1 

     f = FacebookFeed.objects.all()[0] 
     logging.debug('msg: %s' % f.message)

我已經得到了解析JSON響應，提取所有我想要的數據，但不知何故我的對象不corretcly保存。任何想法爲什麼？

這是調試日誌：

2011-05-27 14:15:24,671 DEBUG not fb 
2011-05-27 14:15:24,681 DEBUG check time true 
2011-05-27 14:15:26,607 DEBUG json 
2011-05-27 14:15:26,607 DEBUG while 
2011-05-27 14:15:26,607 DEBUG result True 
2011-05-27 14:15:26,607 DEBUG message: sometext 
2011-05-27 14:15:26,607 DEBUG date: 2011-05-26 14:42:36+0000 
2011-05-27 14:15:26,607 DEBUG date2: 2011-05-26 14:42:36 
2011-05-27 14:15:26,607 DEBUG fb: FacebookFeed object 
2011-05-27 14:15:26,608 DEBUG x: None 
2011-05-27 14:15:26,608 DEBUG sometext 
2011-05-27 14:15:26,608 DEBUG True 
2011-05-27 14:15:26,608 DEBUG msg: None

來源

2011-05-27 voxoft

爲了使您的代碼更易於管理，你應該看看[get_or_create文檔]（https://docs.djangoproject.com/en/dev/ref/models/querysets/#get-or-create）。 – LaundroMat 2011-05-27 13:15:13

def save(self, *args, **kwargs): 
     queryset = FacebookFeed.objects.all() 
     if(queryset): 
      return 
     else: 
      #super(FacebookFeed, self).save() 
      super(FacebookFeed, self).save(*args, **kwargs)

我覺得if(queryset)總是True如果它包含的記錄與否，檢查空查詢集，使用queryset.count() == 0代替

來源

2011-05-27 12:34:47 MBarsi

該死的猜測我搞砸了。因爲我的對象如果已經存在就不會被保存。謝謝。 – voxoft 2011-05-27 12:38:54

未更新的模型字段

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