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How to Successfully Upgrade a Massive Rails App from 4.2 to 6.0

Jerko Č.10 min readMay 28, 2025Technology
Jerko Č.10 min read
Contents:
Introduction: The challenge of upgrading Rails
The initial approach: Following official guidelines
Turning point
A new approach: Starting from scratch
Did it work?
Lesson learned: always start with a clean, working state
Step-by-step process
Pros of the new approach
Potential consequences of the new approach
Final thoughts
Spread the word:
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