Using the unobtrusive gem, Cocoon, learn how to handle multiple models in a single form with accepts_nested_attributes_for.

Learn how to handle multiple models in a single form with accepts_nested_attributes_for and learn how to add and remove nested records through JavaScript.

Using the QuaggaJS Library, learn how to scan and decode barcodes with your Ruby on Rails application. Using provided callbacks, interact with controller actions to provide a seamless experience.

Add an extra level of security to your application with client side encryption. Even over an SSL connection, there are attacks which could expose your users' sensitive information. Using JSEncrypt, learn how to encrypt on the client side and decrypt on the server side.

Learn how to use one of three charting libraries, Chart.js, Highcharts, or Google Charts, using the Chartkick gem to create simple and unobtrusive charts in your application.