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Cheat Sheet
  • Cheat Sheet
  • Git
    • Initialize a new project
    • Make a new commit
    • Revert the most recent commit
    • Create a new branch
    • Setup terminal prompt to show the current git branch
    • Merge a branch into the current branch
    • Push a new branch up to GitHub (if it doesn’t exist there yet)
    • Pull a new branch from to GitHub to a second computer (if it doesn’t exist there yet)
    • Go back to an older commit and re-work from there
    • Delete a git branch
  • Rails
    • Setup Rails 8 w/ SQLite & Solid Cable, Cache & Queue
    • Stripe Pay Gem
      • Running Stripe Test Mode Locally
    • Setup new Rails app
      • Start a new Rails App (v8)
      • Start a new Rails App (v7)
      • Clone Instrumental Template to a new app
    • Rails 7 Turbo/Hotwire Cheatsheet
    • ActiveStorage with AWS S3
    • Live reloading with webpack-dev-server
    • Sidekiq & Redis
      • Setup Sidekiq in a Rails 8 app
      • Clear sidekiq queue
      • Start jobs worker
    • Setup Solid Queue/Cable/Cache in Rails 8 to share a single database
    • Run rspec tests
      • ZipMessage Tests Commands
      • Can't run rspec tests: ActiveRecord::StatementInvalid: PG::DuplicateTable: ERROR: relation "thing"
    • Acts As Tenant (using Rails console)
    • Reset database & re-run migrations
    • Ultrahook for testing email to app
    • Troubleshooting
      • Manage node versions using NVM
      • Webpacker bugs
      • Tailwind updates not showing
      • Fix orphaned migrations
      • rspec error: session not created: This version of ChromeDriver only supports Chrome version
      • “PG::ConnectionBad” error when running local rails server
        • Postgres not started (PG:ConnectionBad error)
    • OLD
      • Start a new Rails app (v6)
        • Install Tailwind CSS on a Rails Project
        • Install Stimulus.js on Rails
        • Install RSpec, Capybara, FactoryBot
        • Install Devise Masqerade
    • Hosting
      • Hatchbox.io + Digital Ocean
      • Fly.io rails app hosting
      • Render rails app hosting
      • Set up a Rails site on Heroku
        • Fix Sidekiq on Heroku
        • Setup app on Heroku for a Client
    • Edit Rails Credentials
    • Run subdomains on local
  • Misc
    • Terminal shortcuts
    • ngrok for tunneling
    • Set up a new Mac
    • Mailcatcher
  • Statamic
  • Forge / Statamic
    • Run Statamic (for Clarityflow) locally
    • Set up to SSH into Forge server
    • Production deploy failed. Resolve by SSH & resolve git conflicts.
  • Old (not using anymore)
    • Heroku
      • Push to Heroku
        • Can't push to heroku. Updates were rejected because the remote contains work you dont have locally
      • Create a Heroku App from command line
      • Set up remotes for staging and production apps
      • Run the Rails Console on Heroku
      • Migrate database on Heroku
      • Make database backups
      • Restart Heroku Dynos
      • Point a root domain (non-subdomain) to heroku
    • Middleman
      • Start a new middleman site from my template
    • Jekyll
      • Start a new Jekyll site from my template
      • Run and work on my Jekyll site
    • Netlify
      • Setup a Jekyll site on Netlify
      • Push to Staging & Production on Netlify
    • Laravel
      • Start a new Laravel app
      • Setup a Mac for running Laravel
    • Design
      • Icomoon Fonts in Rails
    • Sync Sublime Text settings across macs
    • Run a rails project on a new mac for the first time
    • Customize terminal prompt for bash
  • Cursor
    • .cursorrules for Rails + Linear issue writing
  • Mac Environment
    • Install Homebrew for both arm64 and x86
    • Installing Ruby
    • Customize terminal prompt for zsh to show git branch
    • Open terminal in arm64 or Rosetta mode
    • Install Homebrew
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  1. Rails
  2. Troubleshooting

“PG::ConnectionBad” error when running local rails server

If I’m getting the error when trying to run a local server, “PG::ConnectionBad”, try running this then restart server:

rm /usr/local/var/postgres/postmaster.pid

Previousrspec error: session not created: This version of ChromeDriver only supports Chrome versionNextPostgres not started (PG:ConnectionBad error)

Last updated 5 years ago