Django 1.5 - CreateView 不创建/保存新模型

Question

我正试图围绕 CBV。在这里，我使用 CreateView 为我的模板提供一个用于创建新模型的表单（通过 POST）。当我为表单提供有效数据时，它会提交并返回到同一页面，就好像表单有错误一样，但事实并非如此。 HTTP POST 后页面刷新时不会显示错误。我知道验证有效，因为我已经测试了在适当的表单字段中没有提供一些数据的场景，并且有与之关联的错误消息。我检查了数据库，没有插入任何记录。我的数据库配置正确。我有应用程序的其他部分从中读取。该数据库还通过 South 应用了所有当前迁移。

我希望有人能对 CBV 的简单基本设置有所了解。

提前致谢。

models.py

class Guide(models.Model):
    DIFFICULTY_OPTIONS = (
        (u'1', u'Easy'),
        (u'2', u'So so'),
        (u'3', u'Moderate'),
        (u'4', u'Challenging'),
        (u'5', u'Very challenging'),
    )
    title = models.CharField(max_length=100, db_index=True)
    slug = models.SlugField(max_length=100)
    description = models.CharField(max_length=500)
    user = models.ForeignKey(User)    
    difficulty = models.CharField(max_length=1, choices=DIFFICULTY_OPTIONS, default=u'1', null=True, blank=True)
    created = models.DateTimeField(default=datetime.datetime.now(), editable=False)
    modified = models.DateTimeField(default=datetime.datetime.now())
    publish = models.BooleanField(default=False)
    delete = models.BooleanField(default=False)

forms.py

class NewGuideForm(forms.ModelForm):
    title = forms.CharField(widget=forms.widgets.TextInput(attrs={'placeholder': 'Title',
                                                              'class': 'input-block-level'}))
    description = forms.CharField(widget=forms.Textarea(attrs={'placeholder': 'Description',
                                                           'rows': 8,
                                                           'class': 'input-block-level'}))

    class Meta:
        model = Guide
        exclude = ('user', 'slug', 'created', 'modified', 'publish', 'delete', 'modified',)

views.py

class NewGuideView(CreateView):

    model = Guide
    form_class = NewGuideForm
    template_name = "guides/guide_new.html"
    success_url = "/" # Just to keep things simple, redirect to root.

    @method_decorator(login_required)
    def dispatch(self, *args, **kwargs):
        return super(NewGuideView, self).dispatch(*args, **kwargs)

    def form_valid(self, form):
        try:
            Guide.objects.get(title=form.title)
        except ObjectDoesNotExist:
            return super(NewGuideView, self).form_valid(form)
        return super(NewGuideView, self).form_invalid(form)

urls.py

url(r'^guides/new/$', guide.NewGuideView.as_view(), name='guide-new'),

guides/guide_new.html

...
<form method="post">{% csrf_token %}
    {{ form.non_field_errors }}
    <p>First, let's start by entering a title.</p>
    <p>{{ form.title.errors }}</p>
    <p>{{ form.title }}</p>
    <p>Now, provide a short summary of the problem you will be solving.</p>
    <p>{{ form.description.errors }}</p>
    <p>{{ form.description }}</p>
    <p>On a scale of 1 to 5, 5 being the most difficult, how hard is this?</p>
    <p>{{ form.difficulty.errors }}</p>
    <p>{{ form.difficulty }}</p>
    <button type="submit" class="btn-password btn btn-send">Submit</button>
</form>
...

Answer 1

我认为您应该将title 字段称为form.cleaned_data['title'] 而不是form.title。提交的有效字段值在form.cleaned_datadict中。

所以把你的代码改成

def form_valid(self, form):
    try:
        Guide.objects.get(title=form.cleaned_data['title'])
    except ObjectDoesNotExist:
        return super(NewGuideView, self).form_valid(form)
    return super(NewGuideView, self).form_invalid(form)

评估form.title 将导致AttributeError 不在您的方法中处理。