[Fix #1545] Rake task to send accusés de réception that were missed

(because of #1510)

lib/tasks/2018_03_08_send_missed_accuse_reception.rake

@@ -0,0 +1,22 @@
+namespace :'2018_03_08_send_missing_accuse_reception' do
+  task send: :environment do
+    # Send accusés de réception that were missed because of #1510
+    #
+    # The bug was introduced in production with the 2018-03-01-01 release
+    # and fixed with the 2018-03-05-03 release.
+    #
+    # `bug_date` and `fix_date` were determined empirically by looking at the release times,
+    # and checking for dossiers with a missing accusé de réception.
+
+    bug_date = DateTime.new(2018, 3, 1, 9, 15)
+    fix_date = DateTime.new(2018, 3, 5, 18, 35)
+
+    # Only send the accusé for dossiers that are still en construction.
+    # For dossiers that have moved on, other mails have been sent since, and a late
+    # accusé de réception would add more confusion than it’s worth
+    problem_dossiers = Dossier.state_en_construction.where(en_construction_at: bug_date..fix_date)
+    problem_dossiers.find_each do |dossier|
+      NotificationMailer.send_notification(dossier, dossier.procedure.initiated_mail_template).deliver_now!
+    end
+  end
+end