Jumpstarting Applications with ActiveRecord

ActiveRecord is a Ruby gem that serves up an object relational mapper (ORM) for relational database management systems (RDBMSs). In this post, we'll explore how to use it outside of the Rails ecosystem in the service of fleshing out a simple domain model.ActiveRecord provides a Ruby interface for creating, reading, updating, and deleting a database and its constituent tables and data. This interface comes without requiring you to rewrite more than a configuration file when switching from SQLite to PostgreSQL. Databases are a useful addition to any Ruby application because they give us a place to save data--Ruby "flushes" data after each execution session.