Merge pull request #5568 from nhsuk/delete-sessions-no-dates

Add task to delete sessions without dates

Author: thomasleese

lib/tasks/data_migration.rake

@@ -5,4 +5,22 @@ namespace :data_migration do
   task delete_clinic_session_notifications: :environment do
     SessionNotification.where(type: [1, 2]).delete_all
   end
+
+  desc "Delete sessions that have not been scheduled."
+  task delete_unscheduled_sessions: :environment do
+    destroyed_sessions =
+      Session
+        .where(dates: [])
+        .find_each
+        .filter_map do |session|
+          next if session.consent_notifications.exists?
+          next if session.session_notifications.exists?
+          next if session.vaccination_records.exists?
+          next if ConsentForm.where(original_session: session).exists?
+
+          session.tap(&:destroy!)
+        end
+
+    puts "Deleted #{destroyed_sessions.count} sessions"
+  end
 end