make rake task more verbose

lib/tasks/export_public_exercises.rake

@@ -4,7 +4,8 @@ namespace :export_exercises do
   desc 'exports all public exercises to codeharbor'
   task :public, [:codeharbor_link_id] => [:environment] do |_, args|
     codeharbor_link = CodeharborLink.find(args.codeharbor_link_id)
-
+    successful_exports = []
+    failed_exports = []
     Exercise.where(public: true).each do |exercise|
       puts "Exporting exercise \##{exercise.id}"
       error = ExerciseService::PushExternal.call(
@@ -12,10 +13,15 @@ namespace :export_exercises do
         codeharbor_link: codeharbor_link
       )
       if error.nil?
+        successful_exports << exercise.id
         puts "Successfully exported exercise\# #{exercise.id}"
       else
+        failed_exports << exercise.id
         puts "An error occured during export of exercise\# #{exercise.id}: #{error}"
       end
     end
+
+    puts "successful exports: count: #{successful_exports.count} \nlist: #{successful_exports}"
+    puts "failed exports: count: #{failed_exports.count} \nlist: #{failed_exports}"
   end
 end