请帮忙。我收到此错误：
未找到带有参数“()”和关键字参数“{}”的“ev_toggle_attendance”的反向操作。
这是我的html文件：
{% extends "base.html" %}
{% block title %}Tonight - {{ block.super }}{% endblock %}
{% block main_content %}
<a href ="{% url ev_create %}">Create an Event</a>
{% if events %}
{% for event, attending in events %}
<p>{{event.creator.username}}: {{event.description}}</p>
{% if attending %}
<p> You are attending this event.</p>
{% else %}
<p> You are not attending this event. </p>
{% endif %}
<form method="POST" class="toggle_attendance_form" action="{% url ev_toggle_attendance %}">
<input type="hidden" name="event_id" value="{{event.id}}"/>
{% if attending %}
<input class="attendance unattend" type="submit" value="Unattend"/>
{% else %}
<input class="attendance attend" type="submit" value="Attend"/>
{% endif %}
</form>
{% endfor %}
{% else %}
<p>No events for today.</p>
{% endif %}
{% endblock %}
它说错误在这里：
<form method="POST" class="toggle_attendance_form" action="{% url ev_toggle_attendance %}">
urls.py 文件：
from django.conf.urls import patterns, include, url
from events import views
urlpatterns = patterns('',
url(r'^create/$', views.create, name='ev_create'),
url(r'^tonight/$', views.tonight, name='ev_tonight'), #ev_tonight is the name of the url pattern; good for templates
url(r'^toggle-attendance/$', views.toggle_attendance, name='ev_toggle_attendance'),
)
views.py 片段：
from events.models import Event, Attendance
from django.shortcuts import render_to_response, get_object_or_404
from django.template import RequestContext
from events.forms import EventForm
from dateutil.parser import parse
from django.core.urlresolvers import reverse
from django.http import HttpResponseRedirect, Http404
from django.contrib import messages
from django.contrib.auth.decorators import login_required
# Create your views here.
def tonight(request):
events = Event.objects.today().filter(latest=True)
#loop thru all the events and check to see if the currently logged in user is attending the event
attending=[]
for event in events: #for every event in all the events, query for an attendance objects that matches event for the user
try:
Attendance.objects.get(event=event, user=request.user)
attending.append(True)
except Attendance.DoesNotExist: #if can't find it
attending.append(False)
context = {
'events':zip(events, attending), #zip function to merge event and attending
}
return render_to_response('events/tonight.html', context,
context_instance=RequestContext(request) )
#context_instance: context processors: things that get run on request and add context to it; does things like adding the user variable to the template.
def create(request):
form = EventForm(request.POST or None)
if form.is_valid():#check if there's data as well as within the 340 characters limit
event = form.save(commit = False) #won't save to database coz creator isn't yet known
event.creator = request.user
guessed_date = None
for word in event.description.split(): #split on every space - guess the date based on things inside the description
try:
guessed_date = parse(word)
break#if found, break
except ValueError:
continue
event.start_date = guessed_date
event.save() #saves to the database
messages.add_message(request, messages.INFO, 'Your event was posted.')
#redirect user to another url
if 'next' in request.POST: #if somewhere in the post value, there's a next
next = request.POST['next']
else:
next = reverse('ev_tonight') #otherwise, next will be the url with ev_tonight
return HttpResponseRedirect(next)
#if the form isn't valid
return render_to_response(
'events/create.html',
{'form':form},
context_instance = RequestContext(request))
create = login_required(create) #ensuring that the user logged in or can do @login_required before the create model(python >= 2.4)
def toggle_attendance(request):
try:
event_id = int(request.POST['event_id'])#assuming there are values in the post parameter; cast into an it
except (KeyError, ValueError): #raise an exception when: no event id in the post parameter or a value that could not be cast to an int
raise Http404
event = get_object_or_404(Event, id=event_id)
attendance, created = Attendance.objects.get_or_create(user=request.user, event=event)#calling for the user that is logged in and for the event that has already been queried for
if created:
messages.add_message(request, messages.INFO, 'You are now attending "%s"' %event)
else:
attendance.delete()
messages.add_message(request, messages.INFO, 'You are no longer attending "%s"' %event)
#checking to see if there's a next variable in the post parameter; if it isn't assign an empty string
next=request.POST.get('next', '')
if not next: #if it's the empty string
next=reverse('ev_tonight')
return HttpResponseRedirect(next)
toggle_attendance = login_required(toggle_attendance)
主网址文件：
from django.conf.urls import patterns, include, url
# Uncomment the next two lines to enable the admin:
from django.contrib import admin
admin.autodiscover()
urlpatterns = patterns('',
url(r'^events/', include('events.urls')),
# Uncomment the next line to enable the admin:
url(r'^admin/', include(admin.site.urls)),
)
非常感谢您提供的任何帮助。
谢谢。