encoding fix

app/helpers/admin/surveys_helper.rb

@@ -1,4 +1,5 @@
 module Admin::SurveysHelper
+    require 'iconv' unless String.method_defined?(:encode)
   def page_for_survey(survey=nil)
     ann_page = nil
     pages = Page.where(:module=>'survey')
@@ -28,4 +29,15 @@ module Admin::SurveysHelper
       request.protocol+(request.host_with_port+'/'+I18n.locale.to_s+ann_page.url+'/').gsub('//','/') rescue "/"
     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
+
 end

app/views/admin/surveys/export.xlsx.axlsx

@@ -1,25 +1,25 @@
 # encoding: utf-8
 
 wb = xlsx_package.workbook
-wb.add_worksheet(name: @survey.title[0..15]) do |sheet|
+wb.add_worksheet(name: remove_illegal_utf8(@survey.title[0..15])) do |sheet|
 
   row = []
   @survey_questions.each_with_index do |question, i|
     if question.type == 2 or question.type == 3 or question.type == 4 
       question.survey_question_options.each do |option|
-        row << "#{i+1}. #{question.title} - #{option.name}"
+        row << "#{i+1}. #{remove_illegal_utf8 question.title} - #{remove_illegal_utf8 option.name}"
       end
     elsif question.type == 5
       question.survey_question_options.each do |option|
         question.survey_question_radiogroups.each do |radiogroup|
-          row << "#{i+1}. #{question.title} - #{option.name} - #{radiogroup.name}"
+          row << "#{i+1}. #{remove_illegal_utf8 question.title} - #{remove_illegal_utf8 option.name} - #{remove_illegal_utf8 radiogroup.name}"
         end
       end
     else
-      row << "#{i+1}. #{question.title}"
+      row << "#{i+1}. #{remove_illegal_utf8 question.title}"
     end
     if question.custom_option
-      row << "#{i+1}. #{question.title} - #{t('survey_question.use_custom_option')}"
+      row << "#{i+1}. #{remove_illegal_utf8 question.title} - #{t('survey_question.use_custom_option')}"
     end
   end