Using RSpec, learn how to create tests for your application and view your coverage.

Using the Rails 5.1.X defaults, we have a look at what is configured and explore the different types of tests; using the provided MiniTest and Capybara.

Advancing from Single Table Inheritance, learn how Polymorphic Associations differ and tricks to simplify their usage.

Learn to use single table inheritance to allow multiple classes to be stored in the same database table.

Using the paper_trail gem, track changes to model records for auditing purposes and rollback changes when required.