Description:
Generates a database migration and updates the model file (if it exists). Pass the model name, either CamelCased or under_scored, and the event name as an infinitive.
Examples:
`bin/rails generate active_record:event task complete` Generates a migration adding a `completed_at` column to the `tasks` table and updates the Task model. `bin/rails generate active_record:event user confirm --object=email` Generates a migration adding an `email_confirmed_at` column to the `users` table and updates the User model.