模型字段未更新

Question

我想将 facebook 提要添加到我的网站（仅第一条最新的墙消息）。所以我创建了模型：

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

我只想每整小时执行一次提要更新，这就是 check_time 方法的用途。现在我认为正在使用的功能：

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)

我已经解析了 json 响应，提取了我想要的所有数据，但不知何故我的对象没有正确保存。任何想法为什么？

这是调试日志：

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

Answer 1

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

我认为if(queryset) 始终是True，如果它包含记录或不包含记录，要检查空查询集，请改用queryset.count() == 0