我学习django的方法是做一个小的web应用程序,我从现在的第6章开始学习
在视图.py在
category_list = Category.objects.order_by('-likes')[:5]
def index(request):
context = RequestContext(request)
global category_list
context_dict = {'categories': category_list}
for category in category_list:
category.url = category.name.replace(' ', '_')
return render_to_response('rango/index.html', context_dict, context)
def category(request, category_name_url):
context = RequestContext(request)
category_name = category_name_url.replace('_', ' ')
context_dict = {'category_name': category_name}
try:
category = Category.objects.get(name=category_name)
pages = Page.objects.filter(category=category)
context_dict['pages'] = pages
context_dict['category'] = category
except Category.DoesNotExist:
pass
return render_to_response('rango/category.html', context_dict, context)
在网址.py在
^{pr2}$实际上category_name_url=u'python'
这对python很好,但是我不确定在值之前{
该回溯与您的代码不匹配。视图代码显示
Category.DoesNotExist
,而回溯显示category.DoesNotExist
。前者之所以有效,是因为定义了类Category
。后者将不起作用,因为当Category.objects.get()
引发异常时,category
还不存在。在如果上面的视图代码是正确的,那么您就遇到了一些其他问题,导致执行过时的代码。在
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