The Null Object Pattern is an old but good pattern that can help reduce complexity in our applications. In this episode, we'll look at a few different examples.

Add an activity feed to your application with Public Activity.

When displaying a count of records, this will generate extra SQL Queries. Learn how to reduce the number of SQL queries called with counter caching the number of associated records.

Active Record supports application-level encryption. The encryption layer sits between the database and the application. The application will access unencrypted data, but the database will store it encrypted. In this episode, we look at implementing encryption for a model's attribute and Action Text.

Without writing any javascript, we create a highly interactive parent navigation. We will use Turbo Frames to provide the highly interactive experience and build a parent-child relationship from scratch.