Implement ranged user queries

app/helpers/statistics_helper.rb

@@ -187,4 +187,25 @@ module StatisticsHelper
     ]
   end
 
+  def ranged_user_data(interval='year', from=DateTime.new(0), to=DateTime.now)
+    [
+        {
+            key: 'active',
+            name: t('statistics.entries.users.active'),
+            data: ExternalUser.joins(:submissions)
+                      .where(submissions: {created_at: from..to})
+                      .select("date_trunc('#{interval}', submissions.created_at) AS \"key\", count(distinct external_users.id) AS \"value\"")
+                      .group('key').order('key')
+        },
+        {
+            key: 'submissions',
+            name: t('statistics.entries.exercises.submissions'),
+            data: Submission.where(created_at: from..to)
+                      .select("date_trunc('#{interval}', created_at) AS \"key\", count(id) AS \"value\"")
+                      .group('key').order('key'),
+            axis: 'right'
+        }
+    ]
+  end
+
 end

config/locales/de.yml

@@ -751,6 +751,7 @@ de:
       exercises:
         average_number_of_submissions: "Durchschnittliche Zahl von Abgaben"
         submissions_per_minute: "Aktuelle Abgabenhäufigkeit (1h)"
+        submissions: "Abgaben"
       request_for_comments:
         percent_solved: "Beantwortete Anfragen"
         percent_unsolved: "Unbeantwortete Anfragen"
@@ -759,6 +760,7 @@ de:
       users:
         currently_active: "Aktiv (5 Minuten)"
         currently_active60: "Aktiv (60 Minuten)"
+        active: "Aktive Nutzer"
     graphs:
       user_activity: "Nutzeraktivität"
       rfc_activity: "Kommentaranfragenaktivität"

config/locales/en.yml

@@ -751,6 +751,7 @@ en:
       exercises:
         average_number_of_submissions: "Average Number of Submissions"
         submissions_per_minute: "Current Submission Volume (1h)"
+        submissions: "Submissions"
       request_for_comments:
         percent_solved: "Solved Requests"
         percent_unsolved: "Unsolved Requests"
@@ -759,6 +760,7 @@ en:
       users:
         currently_active: "Active (5 minutes)"
         currently_active60: "Active (60 minutes)"
+        active: "Active Users"
     graphs:
       user_activity: "User Activity"
       rfc_activity: "RfC Activity"