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我查看过相关问题,但没有一个答案似乎有效.我正在尝试为用户上传个人资料图片,并让它替换(覆盖)当前图像.保存图像后,我想将文件名更改为用户ID.在它的当前形式中,图像将上传,但它不会替换现有图像(例如,它将保存为2_1.png).

class PhotoForm(forms.ModelForm):
    def save(self):
        content_type = self.cleaned_data['photo'].content_type.split('/')[-1]
        filename = '%d.%s' % (self.instance.user.id, content_type)

        instance = super(PhotoForm, self).save(commit=False)
        instance.photo = SimpleUploadedFile(filename, self.cleaned_data['photo'].read(), content_type)
        instance.save()
        return instance

    class Meta:
        model = UserProfile
        fields = ('photo',)

def photo_form(request):
    if request.method == 'POST':
        form = PhotoForm(data=request.POST, file=request.FILES, instance=request.user.get_profile())
        if form.is_valid():
            form.save()
    else:
        form = PhotoForm()
    return render(request, 'photo_form.html', {'form': form})