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Test Driven Development, or...
Setup your development environment.
Configure your production server.
Learn how to modify production to run websockets.
Using Rails to upload files manually and how you can do it even cleaner using Carrierwave
A look into user accounts, registration, login, forgot your password, and more
Learn how to keep track of your database models and attributes with comments in your application
Advanced techniques on sending emails over SMTP with local views and Mandrill's API with remote templates
Understand how and why the version numbers work for the gems you commonly use
Learn how to easily disable the submit button and display a loading animation when a user submits the form
An advanced look into jQuery UJS and how to use callbacks to improve your UJS workflow and debugging
Dive into routing more deeply than just basic resources and writing routes from scratch
A look into the popular CanCanCan library to add authorization to your Rails app
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