Be careful when storing a model in a session. It will behave differently than you expect and can easily get out of sync with the database. Instead of storing the model directly in the session, store the id to the model and use that to fetch it from the database. (5 minutes)

In the final part of this series you will see how to refactor your tests. Keeping tests clean is important because it will make testing easier to do in the future. (4 minutes)

Testing and refactoring go hand in hand. Refactoring is all about improving code without changing its behavior. Testing is all about making sure you don't change the behavior while you are improving the code. (6 minutes)

Learn how to clean up your code through refactoring. This episode will show you how to move code from the view into the model to remove duplication and simplify the view. (5 minutes)

Are you accepting sensitive user data? Passwords, credit card numbers, etc. By default, Rails stores all submitted parameters in plain text in the logs. This episode will show you how to filter this sensitive input so it doesn't show up in the log file. (2 minutes)

If you want to change something in the layout on a per-template basis, content_for is your answer! This allows templates to specify view code that can be placed anywhere in a layout. (3 minutes)

Everything you wanted to know about layouts: global layouts, controller layouts, shared layouts, dynamic layouts and action layouts. Yes, there really are that many ways to specify a layout. (6 minutes)

It may have a goofy syntax, but the Symbol#to_proc feature Rails adds allows you to do simple blocks very quickly and easily. (3 minutes)

Learn how to use with_scope - a very powerful method which will allow your custom find methods to accept any find options. Just like magic! (2 minutes)

Move a find into the model to clean up the controllers and remove duplication. Also see how you can call these custom find methods through an association. (2 minutes)