Question

我尝试制作更新现有类别的表单，然后重定向回“类别”页面。这是我的代码：

forms.py

class CategoryForm(forms.ModelForm):
    name = forms.CharField(max_length=128, help_text="Please enter the category name.")
    description = forms.CharField(max_length=256, required=False, help_text="Please enter the description of the category.")
    views = forms.IntegerField(widget=forms.HiddenInput(), initial=0)
    slug = forms.CharField(widget=forms.HiddenInput(), required=False)
    status = forms.BooleanField(label='Status',
                               required=False, 
                               help_text="Is this category still active?")

    # An inline class to provide additional information on the form.
    class Meta:
        # Provide an association between the ModelForm and a model
        model = Category
        fields = ('name', 'description', )

views.py

def update_category(request, category_name_slug):
    obj = get_object_or_404(Category, slug=category_name_slug)
    form = CategoryForm(request.POST or None, instance=obj)
    if form.is_valid():
        form.save()
        return HttpResponseRedirect(
                        reverse('obj', kwargs={'category_name_slug':category_name_slug}) )
    return render(request, "courses/update_category.html", {'form': form})

update_category.html

{% block main_content %}
    <h1>Add a Category</h1>
    <form id="update_category_form" method="post" action="">
        {% csrf_token %}
        {{ form.as_p }}
        <br/>
        <input type="submit" name="submit" value="Update Category" />
    </form>
{% endblock %}

当我尝试使用此表单进行更新时，出现NoReverseMatch错误。我觉得它与views.py有关。我怎么写第一次回报？我设法得到另一个更新表格没有slug工作正常，所以它是导致问题的slu ??我需要pk / id吗？感谢。

编辑：这是网址模块：

urls.py

urlpatterns = [
    url(r'^$', views.courses, name='courses'),
    url(r'^about/', views.about, name='about'),
    url(r'^add_category/$', views.add_category, name='add_category'),
    url(r'^category/(?P<category_name_slug>[\w\-]+)/$', views.category, name='category'),
    url(r'^category/(?P<category_name_slug>[\w\-]+)/add_course/$', views.add_course, name='add_course'),
    url(r'^category/(?P<category_name_slug>[\w\-]+)/delete_category/$', views.delete_category, name='delete_category'),
    url(r'^category/(?P<category_name_slug>[\w\-]+)/update_category/$', views.update_category, name='delete_category'),

Answer 1

您应该将类别页面的网址模式名称提供给reverse：

def update_category(request, category_name_slug):
    ...
    if form.is_valid():
        form.save()
        return HttpResponseRedirect(
                        reverse('category', kwargs={'category_name_slug':category_name_slug}) )

Answer 2

错误在于：

body{ overflow: hidden }

您传递的是reverse方法，字符串document.body.style.overflow = "auto";实际上是return HttpResponseRedirect(reverse('obj', ...)个对象。

一种优雅的方法是在'obj'模型中添加get_absolute_url方法，如下所示：

Category

然后，在Category视图中，只需执行以下操作：

class Category(models.Model):

    # model fields here

    def get_absolute_url(self):
        return reverse('category', kwargs={'category_name_slug': self.slug})

制作包含类别slug的更新表单时出现NoReverseMatch错误

2 个答案: