Django: Building REST APIs is the first part in an excellent multi-part series on DRF:
How to optimize your Django REST Viewsets
provides a good step-by-step example about using
prefetch_related in the Django ORM layer to avoid
large numbers of unnecessary queries in your views. Also, props to the
author for wearing a UVA t-shirt in his picture when his blog says he
works as a developer in Blacksburg, Virginia (where Virginia Tech is
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