为什么我的Django表单会不断说“必填字段”？ [英] Why does my Django form keep saying "this field is required"

问题描述

有人知道为什么我的表单（文件选择器）在较简单的版本中工作时会不断返回此字段是必需的吗？

Does anyone know why my form (filepicker) is constantly returning "this field is required" when it worked in a simpler version?

我的视图是

def add_attempt(request, m_id, a_id):
    template = loader.get_template('add_attempt.html')
    if request.method == 'POST':
        import pprint 
        pprint.pprint(request.POST)
        pprint.pprint(request.FILES)
        form = UploadAttemptForm(data=request.POST, files=request.FILES)
        if form.is_valid():
            form.instance.pub_date = datetime.datetime.now()
            form.instance.user_id = request.user
            form.instance.assignment = m.Assignment.objects.get(id=a_id)
            form.save()
            return HttpResponseRedirect(reverse('assignment', args=(m_id, a_id)))
        else:
            print form.errors
    else:
        form = UploadAttemptForm()
    context = RequestContext(request, 
        {
        'form':form,
        })
    return HttpResponse(template.render(context))

我的模型

class Attempt(models.Model):
    user_id = models.ForeignKey(User)
    pdf_filename = models.FileField(storage=settings.S3_STORAGE, upload_to='pdfs')
    pub_date = models.DateTimeField('date uploaded')
    assignment = models.ForeignKey(Assignment)

我的表单是

class UploadAttemptForm(forms.ModelForm):
    def __init__(self, *args, **kwargs):
        super(UploadAttemptForm, self).__init__(*args, **kwargs)

    class Meta():
        model = Attempt
        fields = ['pdf_filename',]

错误打印为

`<QueryDict: {u'submit': [u'Upload Attempt'], u'pdf_filename': [u'something.pdf']}>`

< MultiValueDict：{}>
< ul class = errorlist>< li> pdf_filename< ul class = errorlist>< li>该字段是必填字段。< / li< / ul>< / li>< / ul>

推荐答案

添加我的评论作为适当的答案：

Adding my comment as a proper answer:

请尝试添加 enctype = multipart / form-data 到模板文件中的< form> 元素。

Please try adding enctype= multipart/form-data to your <form> element in your template file.

如果没有此元素，则您的 request.FILES 始终为空。

If you don't have this element your request.FILES will always be empty.

从 https://docs.djangoproject.com/zh-CN/1.7/topics/http/file-uploads/#basic-file-uploads ：

请注意， request.FILES 仅在请求方法为 POST 并且发布请求的< form> 具有属性 enctype = multipart / form-data 。否则， request.FILES 将为空。

Note that request.FILES will only contain data if the request method was POST and the <form> that posted the request has the attribute enctype="multipart/form-data". Otherwise, request.FILES will be empty.

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