Apply automatic rubocop fixes

app/controllers/external_users_controller.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class ExternalUsersController < ApplicationController
   before_action :require_user!
 
@@ -17,8 +19,8 @@ class ExternalUsersController < ApplicationController
     authorize!
   end
 
-  def working_time_query(tag=nil)
-    """
+  def working_time_query(tag = nil)
+    "
     SELECT user_id,
            bar.exercise_id,
            max(score) as maximum_score,
@@ -43,16 +45,16 @@ class ExternalUsersController < ApplicationController
           FROM submissions
           WHERE user_id = #{@user.id}
             AND user_type = 'ExternalUser'
-          #{!current_user.admin? ? "AND study_group_id IN (#{current_user.study_groups.pluck(:id).join(', ')}) AND cause = 'submit'" : ''}
+          #{current_user.admin? ? '' : "AND study_group_id IN (#{current_user.study_groups.pluck(:id).join(', ')}) AND cause = 'submit'"}
           GROUP BY exercise_id,
                    user_id,
                    id
           ) AS foo
       ) AS bar
-    #{tag.nil? ? '' : ' JOIN exercise_tags et ON et.exercise_id = bar.exercise_id AND et.tag_id = ' + tag + ' '}
+    #{tag.nil? ? '' : " JOIN exercise_tags et ON et.exercise_id = bar.exercise_id AND et.tag_id = #{tag} "}
     GROUP BY user_id,
              bar.exercise_id;
-    """
+    "
   end
 
   def statistics
@@ -62,11 +64,11 @@ class ExternalUsersController < ApplicationController
     statistics = {}
 
     ApplicationRecord.connection.execute(working_time_query(params[:tag])).each do |tuple|
-      statistics[tuple["exercise_id"].to_i] = tuple
+      statistics[tuple['exercise_id'].to_i] = tuple
     end
 
     render locals: {
-      statistics: statistics
+      statistics: statistics,
     }
   end
 
@@ -75,15 +77,15 @@ class ExternalUsersController < ApplicationController
     authorize!
 
     statistics = []
-    tags = ProxyExercise.new().get_user_knowledge_and_max_knowledge(@user, @user.participations.uniq.compact)
+    tags = ProxyExercise.new.get_user_knowledge_and_max_knowledge(@user, @user.participations.uniq.compact)
     tags[:user_topic_knowledge].each_pair do |tag, value|
-      statistics.append({key: tag.name.to_s, value: (100.0 / tags[:max_topic_knowledge][tag] * value).round, id: tag.id})
+      statistics.append({key: tag.name.to_s, value: (100.0 / tags[:max_topic_knowledge][tag] * value).round,
+id: tag.id})
     end
-    statistics.sort_by! {|item| -item[:value]}
+    statistics.sort_by! {|item| -item[:value] }
 
     respond_to do |format|
       format.json { render(json: statistics) }
     end
   end
-
 end