Augmenting a Legacy REST API with GraphQL
summary
Adds GraphQL on top of a Rails REST API for a coworking app, keeping REST live while letting clients select fields; workflow: write tests, extract business logic into interactors, declare GraphQL types and queries, then reuse the interactors for mutations. Uses GraphQL Ruby, the Altair Chrome extension, and solves N+1 SQL with BatchLoader / DataLoader by providing a reusable preload_field helper that batches association loads. Web frontend adoption is strong, mobile is neutral, no subscriptions used, deployment runs in production but usage is limited by COVID shutdowns.
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