API V2: Fixed N+1 problem on /items endpoint
#609
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This PR goes part way to resolving #577 by setting up eager loading of nested fields on the
/v2/itemsendpoint.A/B testing reveals a significant increase in server response time on the Django test server:
Previous: ~1200 ms (461 SQL queries)
New: ~250 ms (19 SQL queries)
The test can be repeated by spinning up an instance of the test server and commenting out the
get_queryset()andsetup_eager_loading()function definitions in theItemViewSetclass