Thank you for your contribution @duski.harahap.
After reviewing your contribution, we suggest you following points:
Nice work on the explanations of your code, although adding a bit more comments to the code can be helpful as well.
Thanks for following some of our suggestions in your previous tutorials.
Thank you for your work in developing this tutorial.
Looking forward to your upcoming tutorials.
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RE: Build server APIs with GraphQL and Express #5: Display relation data and Access data relation in resolvers