watching OpenAPI docs

a.rb

initializer 'watch_open_api_docs' do |app|
  app.reloaders << app.config.file_watcher.new([], { Rails.root.join('open_api_docs').to_s => ['yml'] })
  config.to_prepare do
    yaml = YamlRefResolver.new.resolve!(Rails.root.join('open_api_docs', 'index.yml')).to_yaml
    Tempfile.create do |f|
      OpenApiParser::Specification.resolve!(f.path)
    end
  rescue JsonSchema::Error => e
    Rails.logger.error e.full_message
  end
end