ReportsKit shows 'Download CSV' and 'Download Excel' buttons for each report by default, and the downloaded file's filename will either be Report.csv or Report.xls.

If you need to customize the filename, you can do so by using config.report_filename_method. This lambda is evaluated in the context of the controller action that renders the file, so any methods available to that controller can be used in this lambda.

# config/initializers/reports_kit.rb

ReportsKit.configure do |config|
  config.report_filename_method = lambda do |controller|
    report_key = params[:report_params][:key]
    name = report_key == 'posts_by_author' ? 'Posts by Author' : 'Report'
    name += " for #{context_record}" if context_record
    name
  end
end