Refactor exercise statistics to use convert times in Ruby

app/controllers/execution_environments_controller.rb

@@ -3,6 +3,7 @@
 class ExecutionEnvironmentsController < ApplicationController
   include CommonBehavior
   include FileConversion
+  include TimeHelper
 
   before_action :set_docker_images, only: %i[create edit new update]
   before_action :set_execution_environment, only: MEMBER_ACTIONS + %i[execute_command shell list_files statistics sync_to_runner_management]
@@ -107,6 +108,10 @@ class ExecutionEnvironmentsController < ApplicationController
     user_statistics = {}
 
     ApplicationRecord.connection.execute(working_time_query).each do |tuple|
+      tuple = tuple.merge({
+        'average_time' => format_time_difference(tuple['average_time']),
+        'stddev_time' => format_time_difference(tuple['stddev_time']),
+      })
       working_time_statistics[tuple['exercise_id'].to_i] = tuple
     end
 

app/controllers/external_users_controller.rb

@@ -1,6 +1,8 @@
 # frozen_string_literal: true
 
 class ExternalUsersController < ApplicationController
+  include TimeHelper
+
   before_action :require_user!
 
   def authorize!
@@ -68,6 +70,7 @@ class ExternalUsersController < ApplicationController
     statistics = {}
 
     ApplicationRecord.connection.execute(working_time_query(tag&.id)).each do |tuple|
+      tuple = tuple.merge('working_time' => format_time_difference(tuple['working_time']))
       statistics[tuple['exercise_id'].to_i] = tuple
     end