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 --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Django users" group. To post to this group, send email to django-users@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/django-users?hl=en -~----------~----~----~----~------~----~------~--~---
