gistfile1.py

# Get a list of the entities
        entities = Entity.objects.filter(id__in=topic_ids)

        # Build the query to get the entity instances
        entity_story_query = EntityInstance.objects.filter(
            entity_id__in=topic_ids,
            story__content_type__app_label__iexact='sources',
            story__content_type__model__iexact='xmlfeedsource',
        ).distinct(
            'story__update_time',
            'story__id'
        ).select_related(
            'story',
            'story__topics__entity'
            'entity',
        ).prefetch_related(
            'story__source',
            'story__topics',
            'story__topics__entity__groups',
            'story__media_assets'
        ).order_by(
            *order
        )

        # Get the result set
        entity_stories_result = entity_story_query[offset:(offset + num_stories)]

        # Get the entity stories
        entity_stories = [entity_instance.story for entity_instance in entity_stories_result]

        # Get the sources
        source_ids = [story.source.pk for story in entity_stories]
        sources = XmlFeedSource.objects.filter(
            pk__in=source_ids
        ).prefetch_related(
            'uris',
            'categories',
            'tags'
        )

        # Replace the sources of the stories
        for story in entity_stories:
            story.source = [source for source in sources if source.pk == story.source.pk][0]