Rails 8, devcontainer, coverage, refactoring, composition fixes

.devcontainer/Dockerfile

@@ -0,0 +1,17 @@
+# Make sure RUBY_VERSION matches the Ruby version in .ruby-version or gemspec
+ARG RUBY_VERSION=3.4.2
+FROM ghcr.io/rails/devcontainer/images/ruby:$RUBY_VERSION
+
+USER root
+
+# Install pkg-config and SQLite development libraries
+RUN apt-get update -qq && \
+    apt-get install -y pkg-config libsqlite3-dev && \
+    apt-get clean && \
+    rm -rf /var/lib/apt/lists/*
+
+USER vscode
+
+# Ensure binding is always 0.0.0.0
+# Binds the server to all IP addresses of the container, so it can be accessed from outside the container.
+ENV BINDING="0.0.0.0"

.devcontainer/devcontainer.json

@@ -0,0 +1,13 @@
+{
+  "name": "Quo Rails Gem Development",
+  "build": {
+    "dockerfile": "Dockerfile"
+  },
+  "containerEnv": {
+    "RAILS_ENV": "development"
+  },
+  "forwardPorts": [3000],
+  "postCreateCommand": "bundle install && bin/rails db:setup",
+  "postStartCommand": "bundle exec appraisal && bundle exec appraisal rake test",
+  "remoteUser": "vscode"
+}

CLAUDE.md

@@ -0,0 +1,19 @@
+# Quo Development Guide
+
+## Build & Test Commands
+- Run all tests: `bundle exec rake test`
+- Run a single test: `bundle exec ruby -Ilib:test test/path/to/test_file.rb -n test_method_name`
+- Run tests across Rails versions: `bundle exec appraisal rake test`
+- Type checking: `bundle exec steep check`
+- Lint code: `bundle exec standardrb`
+- Fix lint issues: `bundle exec standardrb --fix`
+
+## Code Style Guidelines
+- **Frozen String Literals**: Include `# frozen_string_literal: true` at the top of every file
+- **Types**: Use RBS for type annotations with `# rbs_inline: enabled` and `@rbs` annotations
+- **Naming**: Use snake_case for methods/variables, CamelCase for classes, and SCREAMING_CASE for constants
+- **Error Handling**: Raise specific errors with clear messages
+- **Indentation**: 2 spaces (default Standard Ruby style)
+- **Testing**: Use Minitest for tests
+- **Framework**: Built on Literal gem - use Literal::Struct and Literal::Types
+- **Documentation**: Document public methods with comments

Gemfile

@@ -5,7 +5,7 @@ source "https://rubygems.org"
 # Specify your gem's dependencies in quo.gemspec
 gemspec
 
-gem "rails", "~> 7.2"
+gem "rails", "~> 8"
 
 group :development, :test do
   gem "sqlite3"
@@ -14,6 +14,8 @@ group :development, :test do
 
   gem "minitest", "~> 5.0"
 
+  gem "simplecov", require: false
+
   gem "standard", require: false
 
   gem "steep", require: false

LICENSE.txt

@@ -1,6 +1,6 @@
 The MIT License (MIT)
 
-Copyright (c) 2022-2024 Stephen Ierodiaconou
+Copyright (c) 2022-2025 Stephen Ierodiaconou
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal