medium_queryset_evaluation_caching_related_prefetch.py

    
  queryset = Entry.objects.all()
    for each in queryset:
        print(each.headline)
        # Hits database for blog.
        print(each.blog.name)

    for each in queryset:
        # uses cache
        print(each.headline)
        # No cache, hits database again for blog.
        print(each.blog.name)

    # Use select_related or prefetch_related to cache related objects
    queryset = Entry.objects.select_related('blog')
    for each in queryset:
        print(each.headline)
        print(each.blog.name)

    for each in queryset:
        # uses cache
        print(each.headline)
        # uses cache
        print(each.blog.name)