Canvas-lms update rails 2.3.5 to 3.2.12 [closed]

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I am going to work on the open source Canvas-lms. Its using rails 2.3.5 but i am familar with rails 3.2.12.

1. How to upgrade rails 2.3.5 to rails 3.2.12.
2. What are the challenges.
3. What is the best way to do it.

Answer 1

Include this in your Gemfile:

gem 'rails', '3.2.12'

Then run the command

bundle update rails

I think this is the best way to do it.