han..... I'm a newbie, I've got it, thank you very much On Jun 30, 6:08 pm, Horst Gutmann <[EMAIL PROTECTED]> wrote: > 段叶飞 wrote: > > Request Method: POST > > Request URL:http://127.0.0.1/topic/add/ > > Exception Type: TypeError > > Exception Value: unsupported operand type(s) for +: 'NoneType' and > > 'int' > > Exception Location: E:\Django Workspace\mybar\..\mybar\bar\views.py in > > add_topic, line 71 > > Python Executable: E:\Python25\python.exe > > Python Version: 2.5.1 > > > in my views, the code is: > > > 70 forum = Forum.objects.get(id=forum_id) > > 71 forum.topics = forum.topics+1 // > > 72 forum.save() > > > in my models ,the Forum is: > > > class Forum(models.Model): > > name = models.CharField(maxlength = 32, verbose_name = "forum > > name") > > description = models.CharField(maxlength = 255) > > topics = models.PositiveIntegerField(default = '0', > > blank=True,null = True) > > order = models.PositiveSmallIntegerField(default = '0', null = > > True) > > > def __str__(self): > > return self.name > > > who can help me, thanks > > Probably a stupid question, but why do you allow Forum.topics to be > NULL? If you do that, you will have to check this value before using it. > > -Horst
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