Here I show how to upload files directly to Amazon S3 using CarrierWave Direct and Fog. I then walk through another project which uses jQuery File Upload to handle multiple files and does not use CarrierWave. (14 minutes)

There are several gems to help implement tags in a Rails app. Here I show you how to integrate acts-as-taggable-on and then show how to do it from scratch. (11 minutes)

Here you will learn how to upload multiple files over ajax using jQuery File Upload. I start with the basic functionality and customize it to fit the user interface. (13 minutes)

Memcached is an excellent cache store, and Dalli is the best way to interact with it through Ruby. Here I show various ways to use Memcached in a Rails app including how to set it up in production. (12 minutes)

Learn how to add a calendar to your Rails app. Whether it be a date picker using jQuery UI or a full page calendar for browsing records, I will show you how to do it in this episode. (9 minutes)

Bullet will notify you of database queries that can potentially be improved through eager loading or counter cache column. A variety of notification alerts are supported. (6 minutes)

The strong_parameters gem is an improvement over attr_accessible to securely handle mass assignment even when you have complex authorization logic. The functionality will likely be added to Rails 4 so it is a good idea to learn how it works. (12 minutes)

Ransack allows you to easily build complex search forms. It also helps in adding sortable links and building a dynamic advanced search page. (10 minutes)

Mongoid is a Ruby gem for interacting with MongoDB. Here I show the basics of setting up an app, querying for records, adding embedded associations, overriding the id, and more. (9 minutes)

MiniProfiler allows you to see the speed of a request conveniently on the page. It also shows the SQL queries performed and allows you to profile a specific block of code. (9 minutes)