Fix bad select_related call. In Django 1.8, select_related now throws an error if you give it an invalid field. This was happening. Fix that query. Also noticed an extra query generated in the display_post template. Fixed.

from django.apps import AppConfig


class PotdConfig(AppConfig):
    name = 'potd'
    verbose_name = 'Photo of the Day'
    label = 'potd'

    def ready(self):
        import potd.receivers