UpdateView无法保存表单，点击保存后出现404错误

Question

正如标题所说，我在使用UpdateView时遇到了困难。当我点击保存时，表单没有保存，并且出现了404错误，提示没有找到匹配的用户。我真的很难解决这个问题，已经花了好几个小时在网上查看示例，但还是搞不清楚哪里出错了！如果你能给我一些建议，我会非常感激！

为了更清楚，我希望我的用户能够编辑他们的项目，并且只有该用户可以进行编辑。我怀疑我可能做错了好几件事情！

urls

urlpatterns = patterns('',
        url(r'^$', views.index, name='index'),
        url(r'^register_profile/$', views.register_profile, name='register_profile'),
        url(r'^update_profile/$', views.update_profile, name='update_profile'),
        url(r'^create_project/$', login_required(views.CreateProject.as_view()), name='create_project'),
        url(r'^update_project/(?P<username>\w+)/(?P<slug>[-\w]+)/$', login_required(views.UpdateProject.as_view()), name='update_project'),
        url(r'^(?P<username>\w+)/$', views.profile_page, name='user_profile'),
        url(r'^(?P<username>\w+)/(?P<slug>[-\w]+)/$', views.project_page, name='user_project'),
        )

views

class UpdateProject(UpdateView):
    model = UserProject
    form_class = UserProjectForm
    template_name = 'howdidu/update_project.html'

    def get_object(self, *args, **kwargs):
        obj = super(UpdateProject, self).get_object(*args, **kwargs)
        if obj.user != self.request.user:
            raise PermissionDenied() #or Http404
        return obj

    def form_valid(self, form):
        userproject = form.save(commit=False)
        form.instance.user = self.request.user
        userproject.save()
        self.object = userproject
        return super(UpdateProject, self).form_valid(form)

    def get_success_url(self):
        project_username = self.request.user.username
        project_slug = self.object.slug
        return reverse('user_project', kwargs={'username':project_username, 'slug': project_slug})

models

class UserProject(models.Model):
    user = models.ForeignKey(User)
    title = models.CharField(max_length=100)
    project_overview = models.CharField(max_length=1000)
    project_picture = models.ImageField(upload_to='project_images', blank=True)
    date_created = models.DateTimeField(auto_now_add=True)
    project_views = models.IntegerField(default=0)
    project_likes = models.IntegerField(default=0)
    project_followers = models.IntegerField(default=0)
    slug = models.SlugField(max_length=100, unique=True) #should this be unique or not?

    def save(self, *args, **kwargs):
        self.slug = slugify(self.title)
        super(UserProject, self).save(*args, **kwargs)

    def __unicode__(self):
        return self.title

project.html 模板

{% extends 'howdidu/base.html' %}

{% load staticfiles %}

{% block title %}Project{% endblock %}

{% block body_block %}

        {% if project %}

        <h1>{{ project.title }}</h1>
        <img src="{{ project.project_picture.url }}" width = "300" height = "300"  />
        <h3>{{ project.project_overview }}</h3>
        <p><a href="{% url 'update_project' project_user.username project.slug %}">Edit project</a></p>

        {% else %}
            The specified project {{ project.title }} does not exist!
        {% endif %}

{% endblock %}

update_project.html 模板

{% extends 'howdidu/base.html' %}

{% load staticfiles %}

{% block title %}Update project{% endblock %}

{% block body_block %}

        <h1>Edit your project</h1>

        <form enctype="multipart/form-data" id="UserProjectForm" method="post" action="/update_project/">
          {% csrf_token %}
          {{ form.as_p }}
          <input type="submit" name="submit" value="Save" />
        </form>

{% endblock %}

UpdateView无法保存表单，点击保存后出现404错误

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