From 07341e7aa60fe7c7d4f298136af99276820940e7 Mon Sep 17 00:00:00 2001
From: Eugen Rochko <eugen@zeonfederated.com>
Date: Thu, 14 Oct 2021 20:44:59 +0200
Subject: Add graphs and retention metrics to admin dashboard (#16829)

---
 app/lib/admin/metrics/measure/new_users_measure.rb | 35 ++++++++++++++++++++++
 1 file changed, 35 insertions(+)
 create mode 100644 app/lib/admin/metrics/measure/new_users_measure.rb

(limited to 'app/lib/admin/metrics/measure/new_users_measure.rb')

diff --git a/app/lib/admin/metrics/measure/new_users_measure.rb b/app/lib/admin/metrics/measure/new_users_measure.rb
new file mode 100644
index 000000000..b31679ad3
--- /dev/null
+++ b/app/lib/admin/metrics/measure/new_users_measure.rb
@@ -0,0 +1,35 @@
+# frozen_string_literal: true
+
+class Admin::Metrics::Measure::NewUsersMeasure < Admin::Metrics::Measure::BaseMeasure
+  def key
+    'new_users'
+  end
+
+  def total
+    User.where(created_at: time_period).count
+  end
+
+  def previous_total
+    User.where(created_at: previous_time_period).count
+  end
+
+  def data
+    sql = <<-SQL.squish
+      SELECT axis.*, (
+        WITH new_users AS (
+          SELECT users.id
+          FROM users
+          WHERE date_trunc('day', users.created_at)::date = axis.period
+        )
+        SELECT count(*) FROM new_users
+      ) AS value
+      FROM (
+        SELECT generate_series(date_trunc('day', $1::timestamp)::date, date_trunc('day', $2::timestamp)::date, interval '1 day') AS period
+      ) AS axis
+    SQL
+
+    rows = ActiveRecord::Base.connection.select_all(sql, nil, [[nil, @start_at], [nil, @end_at]])
+
+    rows.map { |row| { date: row['period'], value: row['value'].to_s } }
+  end
+end
-- 
cgit