Rake task to remove old notifications (#575)

README.md

@@ -24,6 +24,19 @@ docker-compose run --rm app bundle exec rake db:create db:schema:load db:seed
 docker-compose up
 ```
 
+## Available tasks
+
+### Notifications removal
+
+You can remove old notifications by running the `notifications:remove_old` task. You can specify the date until you want to preserve notifications and the date from which you will
+remove them. By default it will delete all the notifications from 2017-01-01 older than 1 year if no params are provided.
+
+For example, this one will remove all the notifications from 2023-11-12 to 2024-01-01:
+
+```bash
+bundle exec rake notifications:destroy_old["2024-01-01","2023-11-12"]
+```
+
 ## License
 
 Code published under AFFERO GPL v3 (see [LICENSE-AGPLv3.txt](LICENSE-AGPLv3.txt))

lib/tasks/notifications.rake

@@ -0,0 +1,29 @@
+# frozen_string_literal: true
+
+namespace :notifications do
+  desc "Destroy old notifications"
+  task :destroy_old, [:to, :from] => :environment do |_task, args|
+    args.with_defaults(
+      to: 1.year.ago.strftime("%Y-%m-%d"),
+      from: "2017-01-01"
+    )
+
+    current_date = Date.parse(args.from).beginning_of_month
+    end_date = Date.parse(args.to).beginning_of_month
+    dates = []
+    while current_date <= end_date
+      dates << current_date.strftime("%Y-%m-%d")
+      current_date = current_date.next_month
+    end
+
+    total = 0
+    dates.each do |date|
+      notifications = Decidim::Notification.where("created_at < ?", date)
+      total += notifications.count
+      puts "Destroying #{notifications.count} notifications older than #{date}..."
+      notifications.destroy_all
+    end
+
+    puts "You have successfully destroyed #{total} notifications."
+  end
+end