admin.py

from django.contrib import admin
from polls.models import Poll
from polls.models import Choice


class ChoiceInline(admin.StackedInline):
    model = Choice
    extra = 0

class PollAdmin(admin.ModelAdmin):
    inlines = [ChoiceInline]

admin.site.register(Poll, PollAdmin)

models.py

from django.db import models
import datetime
from django.utils import timezone

from s3direct.fields import S3DirectField

class Poll(models.Model):
    question = models.CharField(max_length=200)
    pub_date = models.DateTimeField('date published')

    def __unicode__(self):  # Python 3: def __str__(self):
        return self.question

    def was_published_recently(self):
        now = timezone.now()
        return now - datetime.timedelta(days=1) <= self.pub_date <= now

    was_published_recently.admin_order_field = 'pub_date'
    was_published_recently.boolean = True
    was_published_recently.short_description = 'Published recently?'

class Choice(models.Model):
    poll = models.ForeignKey(Poll)
    choice_text = models.CharField(max_length=200)
    votes = models.IntegerField(default=0)
    image = S3DirectField(upload_to='images_s3direct')

    def __unicode__(self):  # Python 3: def __str__(self):
        return self.choice_text