Django：UpdateView和ModelForm

Question

对ModelForm使用form_class作为UpdateView时，我遇到了一个奇怪的问题。

首先：使用不带UpdateView标记的form_class时，一切都运行正常。但是，当我尝试使用ModelForm时（因为我想添加MarkdownField），我在浏览器窗口中显示<mediwiki.views.MediwikiForm object at 0x7f990dfce080>。只是用纯文本？

#template/mediwiki/create2.html:
<form action="" method="post">{% csrf_token %}
    {{ form }}
        <input type="submit" value="Save" />
</form>

#views.py:
class EntryUpdate(UpdateView):
    model = Mediwiki
    slug_field = 'non_proprietary_name'
    template_name = "mediwiki/create2.html"
    form_class = MediwikiForm⋅
    #fields = '__all__' #this works...

#forms.py
class MediwikiForm(ModelForm):
#    wiki_page_markdown = MarkdownxFormField()
    class Meta:
        model = Mediwiki⋅
        fields = ['non_proprietary_name', 'category', 'wiki_page_markdown']

#models.py
class Mediwiki(models.Model):
    non_proprietary_name = models.CharField(max_length = 100, unique = True)
    category = models.ManyToManyField(Category)
    wiki_page = models.TextField(blank = True)
    wiki_page_markdown = models.TextField(blank = True)

    def save(self):
        import markdown
        self.wiki_page = markdown.markdown(self.wiki_page_markdown)
        super(Mediwiki, self).save() # Call the "real" save() method.

    def get_absolute_url(self): # For redirect after UpdateView
        return reverse('entry', kwargs={'slug': self.non_proprietary_name})

    def __str__(self):
        return self.non_proprietary_name

#urls.py
url(r'^mediwiki/(?P<slug>\D+)/edit$', EntryUpdate.as_view(), name="update"),

知道什么可能导致此错误吗？任何帮助将不胜感激......