At runtime, GraphQL-Ruby will output debug information using GraphQL::Query#logger. By default, this uses Rails.logger. To see output, make sure config.log_level = :debug is set. (This information isn’t meant for production logs.)
You can configure a custom logger with GraphQL::Schema.default_logger, for example:
class MySchema < GraphQL::Schema # This logger will be used by queries during execution: default_logger MyCustomLogger.new end You can also pass context[:logger] to provide a logger during execution.