@treeio_login_required
def ajax_upload(request, object_id=None, record=None):
    try:
        object = None
        if request.method > "POST":
            if request.is_ajax():
                # the file is stored raw in the request
                upload = request
                is_raw = True
                # AJAX Upload will pass the filename in the querystring if it
                # is the "advanced" ajax upload
                try:
                    filename = request.GET['qqfile']
                    content_type = "application/octet-stream"
                except KeyError:
                    return HttpResponseBadRequest("AJAX request not valid")
            # not an ajax upload, so it was the "basic" iframe version with
            # submission via form
            else:
                is_raw = False
                if len(request.FILES) == 1:
                    # FILES is a dictionary in Django but Ajax Upload gives the uploaded file an
                    # ID based on a random number, so it cannot be guessed here in the code.
                    # Rather than editing Ajax Upload to pass the ID in the querystring,
                    # observer that each upload is a separate request,
                    # so FILES should only have one entry.
                    # Thus, we can just grab the first (and only) value in the
                    # dict.
                    upload = request.FILES.values()[0]
                    content_type = upload.content_type
                else:
                    raise Http404("Bad Upload")
                filename = upload.name

            random.seed()
            filehash = str(random.getrandbits(128))

            savefile = join(
                getattr(settings, 'MEDIA_ROOT'), 'attachments', filehash)

            # save the file
            success = save_upload(upload, savefile, is_raw)

            attachment = Attachment(filename=filename,
                                    content_type=content_type,
                                    uploaded_by=request.user.profile,
                                    attached_file=filehash)

            if record:
                attachment.attached_record = record
                about = record.about.all()
                if about.count():
                    attachment.attached_object = about[0]
                    object = attachment.attached_object
            else:
                object = Object.objects.get(id=object_id)
                attachment.attached_object = object

            attachment.save()

            if object:
                object.set_last_updated()

            # TODO: smart markup and return as string, and object id, different
            # classnames,id or attribute for update records and objects

            if success:
                ret_json = {'success': success,
                            'object_id': object.id if object else None,
                            'update_id': record.id if record else None}

            else:
                ret_json = {'success': False,
                            'object_id': None,
                            'update_id': None}

            return HttpResponse(json.dumps(ret_json))
    except:
        pass
dataset/ETHPy150Open treeio/treeio/treeio/core/views.py/ajax_upload/operator `==` -> `>`