Django：通过FileField将ZipFile保存到数据库时出错

Question

我不太确定该怎么做，但是我的直觉是FileField不接受zip文件吗？尽管我已经了解到FieldField与文件类型无关，所以我不确定在这里出什么问题。

错误消息： AttributeError: 'ZipFile' object has no attribute '_committed'

Models.py

  class UserDownloads(django.db.models.Model):

        user = django.db.models.ForeignKey(
            django.contrib.auth.models.User,
            on_delete=django.db.models.CASCADE,
            blank=True,
            null=True,
        )
        file = django.db.models.FileField(storage=S3Storage())

Views.py

class DownloadZipFileView(LoginAndPermissionMixin, View):
    permission_required = 'downloads.view_userdownloads'

    def get(self, request, *args, **kwargs):
        files = []


            attachments = TaskAttachment.objects.\
                            order_by('-date_entered').\
                            filter(user=self.request.user).\
                            only('file')

        for attachment in list(attachments):
            obj = {'file_name': attachment.file.name, 'url': attachment.file.url}
            files.append(obj)
        zipped_file = get_zipped_file(files)

        A = UserDownloads(file=zipped_file, user=self.request.user)
        A.save()

get_zipped_file函数

def get_zipped_file(files, zip_subdir='attachments'):
    zip_filename = zip_subdir + '.zip'
    byte_stream = io.BytesIO()
    zf = zipfile.ZipFile(byte_stream, 'w')

    for file in files:
        filename = file.get('file_name')
        url = file.get('url')
        file_response = requests.get(url)
        if file_response.status_code == 200:
            f1 = open(filename, 'wb')
            f1.write(file_response.content)
            f1.close()

            fdir, fname = os.path.split(filename)
            zip_path = os.path.join(zip_subdir, fname)
            zf.write(filename, zip_path)

            os.remove(fname)

    zf.close()
    return zf