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Ruby itself

I manage the version of Ruby I'm currently using with rbenv.

Homebrew On macOS or Linux, we recommend installing rbenv with Homebrew.

$ brew install rbenv ruby-build

This will end with you adding a line to your shell config file. Check rbenv docs or run rbenv init for the correct configuration for your shell.

eval "$(rbenv init - zsh)"

Now you can cd into a project directory with a .ruby-version file and install the correct version of Ruby.

~/ $ cd my-app
~/my-app/ $ rbenv install

Gems

If I'm running a project in Docker, I let the Dockerfile handle its business, but I also like to be able to run a local Rails or irb console session.

This means when I pull an updated verson of a project with Gemfile changes, I make sure to run bundle install locally and in the image.

$ bundle install; docker run my-app bundle install

Editor

I'm using VS Code for work with the Ruby LSP plugin installed.

And this is my User-level config:

{
  "rubyLsp.enabledFeatures": {
    "codeActions": true,
    "diagnostics": true,
    "documentHighlights": true,
    "documentLink": true,
    "documentSymbols": true,
    "foldingRanges": true,
    "formatting": true,
    "hover": true,
    "inlayHint": true,
    "onTypeFormatting": true,
    "selectionRanges": true,
    "semanticHighlighting": true,
    "completion": true,
    "codeLens": true,
    "definition": true
  },
  "rubyLsp.rubyVersionManager": "rbenv",
  "rubyLsp.formatter": "rubocop",
  "[ruby]": {
    "editor.defaultFormatter": "Shopify.ruby-lsp"
  },
  "rubyLsp.pullDiagnosticsOn": "save"
}

The plugin communicates nicely with rubocop to handle fast, automatic linting and most importantly, automatic code formatting.

Format Document (rubocop -a $current_file) is a dangerous command in any project with known rubocop violations in areas of the code you aren't involved in, so I use it carefully when visiting other people's code.

Files which are already clean or even better, projects which can be started from scratch, I auto-format all the things, all the time, which helps me meet my goal of NEVER SPENDING 1 EXTRA SECOND THINKING ABOUT CODE FORMATTING.