Implement basic statistics

app/helpers/statistics_helper.rb

@@ -0,0 +1,74 @@
+module StatisticsHelper
+
+  def statistics_data
+    [
+        {
+            key: 'users',
+            name: t('statistics.sections.users'),
+            entries: user_statistics
+        },
+        {
+            key: 'exercises',
+            name: t('statistics.sections.exercises'),
+            entries: exercise_statistics
+        },
+        {
+            key: 'request_for_comments',
+            name: t('statistics.sections.request_for_comments'),
+            entries: rfc_statistics
+        }
+    ]
+  end
+
+  def user_statistics
+    [
+        {
+            key: 'internal_users',
+            title: t('activerecord.models.internal_user.other'),
+            data: InternalUser.count
+        },
+        {
+            key: 'external_users',
+            title: t('activerecord.models.external_user.other'),
+            data: ExternalUser.count
+        }
+    ]
+  end
+
+  def exercise_statistics
+    [
+        {
+            key: 'exercises',
+            title: t('activerecord.models.exercise.other'),
+            data: Exercise.count
+        },
+        {
+            key: 'average_submissions',
+            title: t('statistics.entries.exercises.average_number_of_submissions'),
+            data: Submission.count / Exercise.count
+        }
+    ]
+  end
+
+  def rfc_statistics
+    [
+        {
+            key: 'rfcs',
+            title: t('activerecord.models.request_for_comment.other'),
+            data: RequestForComment.count
+        },
+        {
+            key: 'percent_solved',
+            title: t('statistics.entries.request_for_comments.percent_solved'),
+            data: (100.0 / RequestForComment.count * RequestForComment.where(solved: true).count).round(2),
+            unit: '%'
+        },
+        {
+            key: 'comments',
+            title: t('activerecord.models.comment.other'),
+            data: Comment.count
+        },
+    ]
+  end
+
+end