survey/lib/tasks/survey_tasks.rake

# desc "Explaining what the task does"
# task :survey do
#   # Task goes here
# end
namespace :survey_tasks do
  task :prepare_download,[:surveyid] => :environment do |task,args|
    puts "Cron initiated with #{args.surveyid}"
    id = args.surveyid
    I18n.locale = :zh_tw
    survey = QuestionnaireSurvey.find(id)
    chart_data, survey_questions, survey_answers = survey.generate_chart_data
    ac = ActionController::Base.new()
    xlsx = ac.render_to_string handlers: [:axlsx], formats: [:xlsx], template: "survey_export/export", locals: {survey: survey, survey_questions: survey_questions, survey_answers: survey_answers}
    dirname = "public/uploads/survey_export/#{id}"
    FileUtils.mkdir_p(dirname) unless File.exists?(dirname)
    f = "#{dirname}/#{survey.title.gsub(/[ "'*@#$%^&()+=;:.,?>|\\\/<~_!：，、。！？；「」〈〉【】／]/,'')}.xlsx"
    if File.exists?(f)
      File.delete(f)
    end
    file = File.open(f, "w")
    xlsx.force_encoding("utf-8")
    file.write(xlsx)
  end 
end

def remove_illegal_utf8(str)
  if String.method_defined?(:encode)
    str.encode!('UTF-8', 'UTF-8', :invalid => :replace)
  else
    ic = Iconv.new('UTF-8', 'UTF-8//IGNORE')
    str = ic.iconv(str)
  end
  str
end