title: Rails Email with Unsubscribe link
body: <p>I am working on a Rails 4.2 app that has recurring weekly events that people register for. They will get a reminder email before each event (so weekly). I want a one click unsubscribe link on the email. This seems like a common task but I haven't found a good current solution. Some directions I have seen are to use MessageVerifier which was new to Rails 4.1 and doesn't require saving a token string to compare to in the database. What are the steps to accomplish this. I have a user model and an event model. Emails are sent to registered users who signed up for the recurring event. </p>