Implementing queries on a GraphQL server

When I started learning GraphQL, I used to put all my resolvers into one file

Part 2 of my @GraphQL series shows you how to properly implement queries on your server.

If you missed part 1 (GraphQL basics), here it is: https://medium.com/naresh-bhatia/graphql-concepts-i-wish-som...

I'll be releasing one part a day for the next week (in case you'd like some holiday travel reading). Here's what you can look forward to.

Part 3: Queries (client implementation)

Part 4: Mutations (server implementation)

Part 5: Mutations (client implementation)

Part 6: Subscriptions (server implementation)

Part 7: Subscriptions (client implementation)

What have you struggled with in GraphQL? I'd love to hear your stories and make it easier to get started.