Upgrade Rails application to Ruby 3.4.1 and Rails 8.0.4 #582
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This PR upgrades the Judge0 Rails application from the end-of-life Ruby 2.7.0 to Ruby 3.4.1, and from Rails 6.1 to Rails 8.0.4. Key changes: - Ruby 3.4.1 compiled from source in Dockerfile (compilers base image unchanged) - Rails 8.0.4 with updated gem dependencies - Compatibility layer for Rails.application.secrets (removed in Rails 7.1+) - Fixed deprecated Redis gem options - Removed annotate gem (incompatible with Rails 8) - Added Debian Buster archive repository fix User code submissions still use Ruby 2.7.0 from the compilers base image. All API endpoints tested and working.
The original approach of reopening Rails::Application class didn't work in Rails 8 because the Judge0API::Application class doesn't properly inherit the dynamically added method. Changed to use module prepending which ensures the secrets method is available on the application instance. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
Dir.exists? was removed in Ruby 3.2+. Updated to use Dir.exist? instead. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
ENV.fetch with a default value still returns empty string when the variable is set but empty (e.g., RAILS_MAX_THREADS= in config file). Use .presence to properly fall back to defaults when value is blank. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
BREAKING CHANGE: Updated base image from Debian Buster to Ubuntu 22.04 Language updates: - GCC: 7.4/8.3/9.2 → 11.4/12.3/13.1 - Clang: 7.0.1 → 17 - Python: 2.7/3.8 → 3.11/3.12 - Ruby: 2.7.0 → 3.3.0 - Node.js: 12.14.0 → 20.11.0 - Java: OpenJDK 13 → OpenJDK 21 - Go: 1.13.5 → 1.22.0 - Rust: 1.40.0 → 1.75.0 - TypeScript: 3.7.4 → 5.3.3 - Kotlin: 1.3.70 → 1.9.22 - Swift: 5.2.3 → 5.9.2 - .NET: 3.1 → 8.0 - Scala: 2.13.2 → 3.3.1 - PHP: 7.4.1 → 8.1 New languages added: - Zig 0.11.0 - Nim 2.0.2 - Dart 3.2 - Julia 1.10.0 - SWI-Prolog 9.0 Removed deprecated languages: - Python 2.7 (EOL) - Basic (FBC) - Octave - Objective-C - Visual Basic.Net Version bumped to 1.14.0 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
- Use rogerheykoop/compilers:2.0.0 as base image (pending merge to judge0/compilers) - Remove embedded compiler installations (now in compilers image) - Keep only Rails application setup (Ruby 3.4.1, bundler, gems) - Update db/schema.rb to Rails 8.0 format This restores the proper separation of concerns: - compilers image: All language compilers/interpreters + isolate sandbox - judge0 image: Rails application layer only The Dockerfile is now 75 lines instead of 373 lines.
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Judge0 Rails 8.0 Upgrade
Overview
This PR upgrades the Judge0 Rails application from Ruby 2.7.0 + Rails 6.1 to Ruby 3.4.1 + Rails 8.0.4.
Architecture Decision
Ruby 3.4 is installed directly in the judge0 Dockerfile, separate from the compilers base image.
The
judge0/compilers:1.4.0base image was intentionally left unchanged.Version Summary
Changes Made
Dockerfile
bundle config set force_ruby_platform truefor native gem compilationGemfile
~> 8.0.0annotategem (incompatible with Rails 8)config/application.rb
config.load_defaults 8.0config/puma.rb
ENV.fetchto prevent crashesconfig/initializers/resque.rb
thread_safe: trueoption (deprecated in Redis gem 5.x)config/initializers/secrets.rb (NEW)
Rails.application.secrets(removed in Rails 7.1+)docker-compose.dev.yml
env_fileanddepends_onto judge0 serviceDeleted Files
lib/tasks/auto_annotate_models.rake- Referenced removed gemBreaking Changes Addressed
Testing
Verified locally with Docker:
GET /languages- 200 OK (48 languages)GET /about- 200 OK (version 1.13.1)Build Notes
First build takes ~12 minutes due to Ruby compilation. Subsequent builds use cached layers.