我刚刚从我的github中提取,并尝试在我的Ubuntu上设置我的应用程序(我最初在家中的Mac上运行我的应用程序)。Django:ImportError:无法导入名称Count
我重新创建数据库,并重新配置settings.py - 也更新模板位置等
然而,当我运行服务器“蟒蛇manage.py runserver命令”得到一个错误,指出:
ImportError: cannot import name Count
我进口伯爵在我的views.py使用注释():
from django.shortcuts import render_to_response
from django.http import Http404, HttpResponse, HttpResponseRedirect
from django.db.models import Count
from mysite.blog.models import Blog
from mysite.blog.models import Comment
from mysite.blog.forms import CommentForm
def index(request):
#below, I used annotate()
blog_posts = Blog.objects.all().annotate(Count('comment')).order_by('-pub_date')[:5]
return render_to_response('blog/index.html',
{'blog_posts': blog_posts})
为什么不工作?此外,如果我删除“导入计数”行,错误消失,我的应用程序功能正常。
感谢, Wenbert
UPDATE:
我的models.py如下:
from django.db import models
class Blog(models.Model):
author = models.CharField(max_length=200)
title = models.CharField(max_length=200)
content = models.TextField()
pub_date = models.DateTimeField('date published')
def __unicode__(self):
return self.content
def was_published_today(self):
return self.pub_date.date() == datetime.date.today()
class Comment(models.Model):
blog = models.ForeignKey(Blog)
author = models.CharField(max_length=200)
comment = models.TextField()
url = models.URLField()
pub_date = models.DateTimeField('date published')
def __unicode__(self):
return self.comment
更新2
我的urls.py看起来是这样的:
from django.conf.urls.defaults import *
from django.contrib import admin
admin.autodiscover()
urlpatterns = patterns('',
(r'^admin/(.*)', admin.site.root),
(r'^blog/$','mysite.blog.views.index'),
(r'^display_meta/$','mysite.blog.views.display_meta'),
(r'^blog/post/(?P<blog_id>\d+)/$','mysite.blog.views.post'),
)
什么是您的models.py样子?你有Method/Class Count吗? – rh0dium 2009-09-24 03:27:32
你肯定使用相同版本的Django,是吗? – Wogan 2009-09-24 03:33:58
@ rh0dium,我更新了我的帖子。 – wenbert 2009-09-24 03:47:30