Most Rails app has some kind of need for tags. There’s plenty of gems out there and one of the most popular one is acts-as-taggable-on. But if you’re using PostgreSQL for your Rails app you can use PostgreSQLs array data type instead. In this blog post I’m going to show how you can make use of them in Rails 4. Setup Make sure you have the Rails 4 gem activated and PostgreSQL installed then run: ra