[python-chinese] 请教python中super的用法

[Brightman]

不好意思，说得不是很清楚。taginfo content_object都有的。
yellow=TagInfo.objects.get(name="yellow")
food=Forum.objects.get(name="food")
tag1=TagMap(taginfo=yellow,content_object=food)
 >>> tag1.taginfo
Traceback (most recent call last):
  File "<console>", line 1, in <module>
  File 
"C:\Python25\Lib\site-packages\django\db\models\fields\related.py", line
165, in __get__
    raise self.field.rel.to.DoesNotExist
DoesNotExist
 


黄毅 写道:
>         self.taginfo.count += 1
>         self.taginfo.save()
>         super(TagMap,self).save()
>  
> 出错的语句是第一句，应该没有对应的 taginfo，你试试把 super...save()   
> 那句提前。
>
>  
> On 4/24/07, *Brightman* <mr.brightman在gmail.com 
> <mailto:mr.brightman在gmail.com>> wrote:
>
>
>     这是django中的一个简单应用，希望在TagMap的save delete行为中修改
>     TagInfo的计数。
>     class TagInfo(models.Model):
>         name = models.CharField(maxlength=50)
>         count = models.IntegerField(default=0)
>         def __str__(self):
>             return self.name <http://self.name/>
>        
>
>     class TagMap(models.Model):
>         taginfo = models.ForeignKey (TagInfo)
>         content_type = models.ForeignKey(ContentType)
>         object_id = models.IntegerField()
>         content_object = models.GenericForeignKey()
>        
>         class Meta:
>             ordering = ["taginfo"]
>         def __str__(self):
>             return self.taginfo.name <http://self.taginfo.name/>
>         def save(self):
>             self.taginfo.count += 1
>             self.taginfo.save()
>             super(TagMap,self).save()
>         def delete(self):
>             self.taginfo.count -= 1
>             self.taginfo.save()
>             super(TagMap,self).delete()
>
>     汇报如下错误，对python的super用法不熟，现请教一下，谢谢！
>     >>> tag1=TagMap(taginfo=fatty,content_object=food)
>     >>> tag1.save()
>     Traceback (most recent call last):
>       File "<console>", line 1, in <module>
>       File "D:\project\superstar\..\superstar\apps\forum\models.py",
>     line 38, in sav
>     e
>         self.taginfo.count += 1
>       File
>     "C:\Python25\Lib\site-packages\django\db\models\fields\related.py",
>     line
>     165, in __get__
>         raise self.field.rel.to.DoesNotExist
>     DoesNotExist
>     >>> tag1.taginfo
>     Traceback (most recent call last):
>       File "<console>", line 1, in <module>
>       File
>     "C:\Python25\Lib\site-packages\django\db\models\fields\related.py",
>     line
>     165, in __get__
>         raise self.field.rel.to.DoesNotExist
>     DoesNotExist
>      
>
>     _______________________________________________
>     python-chinese
>     Post: send python-chinese在lists.python.cn
>     <mailto:python-chinese在lists.python.cn>
>     Subscribe: send subscribe to
>     python-chinese-request在lists.python.cn
>     <mailto:python-chinese-request在lists.python.cn>
>     Unsubscribe: send unsubscribe to
>      python-chinese-request在lists.python.cn
>     <mailto:python-chinese-request在lists.python.cn>
>     Detail Info: http://python.cn/mailman/listinfo/python-chinese
>
>
>
>
> -- 
> http://codeplayer.blogspot.com/
> ------------------------------------------------------------------------
>
> _______________________________________________
> python-chinese
> Post: send python-chinese在lists.python.cn
> Subscribe: send subscribe to python-chinese-request在lists.python.cn
> Unsubscribe: send unsubscribe to  python-chinese-request在lists.python.cn
> Detail Info: http://python.cn/mailman/listinfo/python-chinese

-------------- 下一部分 --------------
一个HTML附件被移除...
URL: http://python.cn/pipermail/python-chinese/attachments/20070425/af10799b/attachment.html