I am simply following https://graphql-ruby.org/getting_started

This GraphQL engine is based on Rails. They have GraphQL schema defined with DSL.

rails g graphql:install
bundle install

Use command

rails g graphql:object Post title:String rating:Int comments:[Comment]

Or define them in app/graphql/types/

I am gonna follow https://www.howtographql.com/graphql-ruby/0-introduction/

1. Create a model (resource), and migrate
2. Add the type for the model
3. Make a query type
4. Build mutation for this type

1. Change model
2. Add new field in object type

1. Run everything: bundle exec rails test
2. Run a file: rails test <file_path>
3. Run a test case by line number: rails test <file_path>:<line_number>