This template is supposed to be applied to rails 5.
run with:
rails new <application_name> --template=https://gist.githubusercontent.com/karloku/edd6a158e275fdefa334/raw/b56175bee5b45d32310aeb620e23be44e3c2a56d/graphql_template.rb -T
using gems:
- graphql
- graphql-mutable_type