Django store uploaded file in S3

Question

I have this class that exposes a POST endpoint to an API consumer using Django REST framework.

The code is supposed to receive a file upload, and then upload it to S3. The file is uploaded correctly to the Django app (file_obj.length returns the actual file size), and the object is created in S3. However, the file size in S3 is zero. If I log the return of file_obj.read() it is empty as well.

What is wrong?

from django.conf import settings

from rest_framework.views import APIView
from rest_framework.response import Response
from rest_framework.parsers import FileUploadParser
from boto.s3.connection import S3Connection
from boto.s3.key import Key

from .models import Upload
from .serializers import UploadSerializer


class UploadList(APIView):
    parser_classes = (FileUploadParser,)

    def post(self, request, format=None):
        file_obj = request.FILES['file']

        upload = Upload(user=request.user, file=file_obj)
        upload.save()

        conn = S3Connection(settings.AWS_ACCESS_KEY, settings.AWS_SECRET_KEY)
        k = Key(conn.get_bucket(settings.AWS_S3_BUCKET))
        k.key = 'upls/%s/%s.png' % (request.user.id, upload.key)
        k.set_contents_from_string(file_obj.read())

        serializer = UploadSerializer(upload)

        return Response(serializer.data, status=201)

Answer 1

Is it possible that something is reading the file object already, perhaps your Upload class save method, and you need to seek back to the beginning?

file_obj.seek(0)