Group statistics per user type

app/models/exercise.rb

@@ -11,7 +11,10 @@ class Exercise < ActiveRecord::Base
   belongs_to :execution_environment
   has_many :submissions
   belongs_to :team
-  has_many :users, source_type: ExternalUser, through: :submissions
+
+  has_many :external_users, source: :user, source_type: ExternalUser, through: :submissions
+  has_many :internal_users, source: :user, source_type: InternalUser, through: :submissions
+  alias_method :users, :external_users
 
   scope :with_submissions, -> { where('id IN (SELECT exercise_id FROM submissions)') }
 
@@ -22,6 +25,7 @@ class Exercise < ActiveRecord::Base
   validates :title, presence: true
   validates :token, presence: true, uniqueness: true
 
+
   def average_percentage
     (average_score / maximum_score * 100).round if average_score
   end

app/views/exercises/statistics.html.slim

@@ -8,14 +8,16 @@ h1 = @exercise
   p == @exercise.average_score ? t('shared.out_of', maximum_value: @exercise.maximum_score, value: @exercise.average_score.round(2)) : empty
   p = progress_bar(@exercise.average_percentage)
 
-.table-responsive
+- Hash[:internal_users => t('.internal_users'), :external_users => t('.external_users')].each_pair do |symbol, label|
+  strong = label
+  .table-responsive
     table.table
       thead
         tr
           - ['.user', '.score', '.runs', '.worktime'].each do |title|
             th.header = t(title)
       tbody
-      - @exercise.users.distinct().each do |user|
+        - @exercise.send(symbol).distinct().each do |user|
           tr
             - submissions = @exercise.submissions.where('user_id=?', user.id)
             td = "#{user.name} (#{user.email})"

config/locales/de.yml

@@ -244,10 +244,12 @@ de:
       intermediate_submissions: Intermediäre Abgaben
       participants: Bearbeitende Nutzer
       users: '%{count} verschiedene Nutzer'
-      user: 'Nutzer'
+      user: Nutzer
-      score: 'Punktzahl'
+      score: Punktzahl
-      runs: 'Versuche'
+      runs: Versuche
-      worktime: 'Arbeitszeit'
+      worktime: Arbeitszeit
+      internal_users: Interne Nutzer
+      external_user: Externe Nutzer
     submit:
       failure: Beim Übermitteln Ihrer Punktzahl ist ein Fehler aufgetreten. Bitte versuchen Sie es später erneut.
   files:

config/locales/en.yml

@@ -248,6 +248,8 @@ en:
       score: Score
       runs: Runs
       worktime: Worktime
+      internal_users: Internal Users
+      external_users: External Users
     submit:
       failure: An error occured while transmitting your score. Please try again later.
   files: