Django错误：字符串索引必须是整数，而不是字符串

Question

我遇到了这个错误。怎么才能修改POST表单的数据，确保图片能够被保存呢？

错误类型：在 /photos/add_photos/ 这个地址出现了问题。
错误信息：字符串的索引必须是整数，而不是字符串。
请求方式：POST
请求地址：/photos/add_photos/
Django版本：1.6.5
异常类型：TypeError
异常内容：字符串的索引必须是整数，而不是字符串。

@login_required
    def addimage(request):
        user = request.user
        blogposts = Blogpost.objects.filter(user=user)
        imageformset = formset_factory(Image, AddImageForm,extra=1)
        if request.method == "POST":
            formset = imageformset(request.POST, request.FILES)
            print formset
            if formset.is_valid() :
                for form in formset.cleaned_data:
                        image = form['image']
                        title = form['title']
                        blogpost = form['blogpost']
                        description = form['description']
                        photo = Image(
                            title = title,
                            image= image,
                            blogpost=blogpost,
                            description=description,
                            )
                        photo.user = request.user
                        photo.save()

                        messages.success(request, 'We did it. Pictures are on the interwebs!')
                        return HttpResponseRedirect("/%s/%s/" % (user, blogpost.slug))
            else:
                messages.error(request, 'Oh no! Something went wrong. Try again.')
                return HttpResponseRedirect('/photos/add_photos/')

        else:
            formset = imageformset()
            formset.fields['blogpost'].queryset = Blogpost.objects.filter(user=user)

        return render_to_response('photos/add_photos.html', {
            'formset' : formset,
            'blogpost' : blogposts,
            },
            context_instance=RequestContext(request))

Answer 1

错误出现在这一行：

for form in formset.cleaned_data:

你需要做的是遍历 formset.forms，然后对每个表单访问 cleaned_data：

for form in formset:
    image = form.cleaned_data['image']
    ..etc...