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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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