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Wouldn't it be more resource efficient to traverse the graph ahead of time and prefetch all related resources with a single query?

This is more or less what dataloader accomplishes. Generally speaking when creating a gql service, graph traversal is not app code but library code.

Dataloader avoids the N+1 but I wouldn't call it a good solution, you have to twist your app code to make it work. Its an inelegant solution, imo.

Not more than you’re already twisting it using resolvers? I’ll admit it will look like magic though.