Upgrading from Rails 4 to Rails 4.2

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In this video I show what you need to do in order to upgrade from Rails version 4.0 to version 4.2, including how to find gem dependencies that are causing errors.
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I've loved this series. I've enjoyed you as a rails teacher. Building feature by feature and explaining the whys has made me enjoy the learning.
I know you said there are many social applications out there, but I would love to see how I can implement friendships among users. I am working on a school management /social application. Thank you so much.

mjndahiro