cache.py 文件源码

def retrieve(self, key, field_name):
        metadata = self.metadata(key)
        content = self.backend.get(self.prefix(key) + '_content')
        if metadata and content:
            out = BytesIO()
            out.write(content)
            upload = InMemoryUploadedFile(
                file=out,
                field_name=field_name,
                name=metadata['name'],
                content_type=metadata['content_type'],
                size=metadata['size'],
                charset=metadata['charset'],
            )
            upload.file.seek(0)
        else:
            upload = None
        return upload