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rails-upgrade-5-to-6

Plan Ruby on Rails 5.x to 6.x upgrades with Zeitwerk migration guidance.

21|2|Updated May 24, 2026
Search Tags:#upgrade#rails#ruby-on-rails#autoloader#zeitwerk#webpacker#rails-6
One-click install
npx skills add https://github.com/sandeepmvl/rails-skills --skill rails-upgrade-5-to-6
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: rails-upgrade-5-to-6
Source: https://github.com/sandeepmvl/rails-skills/tree/main/skills/18-rails-upgrade-5-to-6
Command: npx skills add https://github.com/sandeepmvl/rails-skills --skill rails-upgrade-5-to-6

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

Upgrading a Ruby on Rails application from 5.x to 6.x introduces high-risk breaking changes including the mandatory Zeitwerk autoloader transition, default Webpacker adoption, and credential system overhauls that can cause unexpected runtime errors and broken functionality if handled incorrectly.

Core Features & Use Cases

  • Safe Version Hop Sequence: Guides teams through the recommended 5.0 → 5.1 → 5.2 → 6.0 → 6.1 upgrade path to minimize risk.
  • Zeitwerk Migration Support: Provides step-by-step instructions for transitioning from the Classic autoloader, including check mode usage and inflection fixes for common naming mismatches.
  • Informed Webpacker Decisions: Helps teams evaluate whether to adopt Webpacker, stick with Sprockets, or defer to Rails 7 importmap based on their actual JavaScript needs.
  • Use Case: A team maintaining a Rails 5.2 e-commerce application can use this skill to plan and execute a smooth upgrade to Rails 6.1 without breaking existing autoloaded classes or asset pipelines.

Quick Start

Use the rails-upgrade-5-to-6 skill to create a safe, step-by-step upgrade plan for your Rails 5.x application to Rails 6.x, including Zeitwerk autoloader migration guidance and Webpacker adoption recommendations.

Frequently Asked Questions about rails-upgrade-5-to-6

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I upgrade Ruby on Rails from version 5 to 6 safely?▼

Zeitwerk is the default autoloader in Rails 6, replacing the Classic autoloader. Transitioning requires using check mode and applying inflection fixes to resolve common naming mismatches, preventing unhandled autoload errors during the version hop.

Do I need to adopt Webpacker when upgrading to Rails 6?▼

You do not need to adopt Webpacker when upgrading Rails 6. You can stick with Sprockets or defer to Rails 7 importmap, evaluating your actual JavaScript needs to avoid unnecessary asset pipeline overhauls and runtime errors.

What is the best way to migrate credentials from secrets.yml in Rails 6?▼

The best way to migrate credentials from secrets.yml is to follow the production-safe upgrade workflow. This credential system overhaul is part of the Rails 6 transition, requiring careful planning to avoid broken functionality and unexpected runtime errors.

Does Rails 6.1 support multiple databases out of the box?▼

Rails 6.1 does support multiple databases natively. The upgrade skill covers multi-database support configuration for Rails 6.1, allowing development teams to implement this feature safely during their version hop from Rails 5.x.

Why does my Rails 6 upgrade cause autoload mismatches and runtime errors?▼

Rails 6 upgrade autoload mismatches occur due to the mandatory Zeitwerk autoloader transition. Unhandled naming inflections cause runtime errors, which you can resolve by running check mode and fixing naming mismatches before completing the upgrade.

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