module CopyTunerClient::Rails

def self.controller_of_rails_engine?(controller)
  # SEE: https://github.com/rails/rails/blob/539144d2d61770dab66c8643e744441e52538e09/activesupport/lib/active_support/core_ext/module/introspection.rb#L39-L63
  engine_namespaces.include?(controller.class.module_parents[-2])
end