added a rake task to email retention to admins

app/mailers/notifier.rb

@@ -6,17 +6,23 @@ class Notifier < ActionMailer::Base
   def self.admin(string, recipients, opts = {})
     mails = []
     recipients.each do |rec|
-      mail = single_admin(string, rec)
+      mail = single_admin(string, rec, opts)
       mails << mail
     end
     mails
   end
 
-  def single_admin(string, recipient)
+  def single_admin(string, recipient, opts={})
     @receiver = recipient
     @string = string.html_safe
-    mail(:to => @receiver.email,
-         :subject => I18n.t('notifier.single_admin.subject'), :host => AppConfig[:pod_uri].host)
+
+    default_opts = {:to => @receiver.email,
+         :from => AppConfig[:smtp_sender_address],
+         :subject => I18n.t('notifier.single_admin.subject'),  :host => AppConfig[:pod_uri].host}
+    default_opts.merge!(opts)
+
+
+    mail(default_opts)
   end
 
   def started_sharing(recipient_id, sender_id)

lib/tasks/stats.rake

@@ -0,0 +1,21 @@
+require File.join(Rails.root, 'lib', 'statistics' )
+
+namespace :stats do
+  desc 'Emails recent engagement statistics the admins'
+  task :email_retention => :environment do
+
+    return unless AppConfig[:admins].present? 
+
+    admins =  User.find_all_by_username( AppConfig[:admins])
+
+    require 'fastercsv'
+
+    string = FasterCSV.generate do |csv|
+      (0..32).each do |i|
+        csv << [i.to_s, Statistics.new.retention(i)]
+      end
+    end
+
+    Notifier.admin(string, admins, {:subject => "retention numbers #{Time.now.to_s}"})
+  end
+end