Example rake task to generate ~/.pgpass based on info fetched from heroku:config

pgpass.rake

namespace :db do
  require 'uri'
  desc "Uses heroku:config for APP to forcefully create ~/.pgpass"
  task :create_pgpass do
    app = ENV['APP'] || 'whatever-your-default-app-is'
    uri = URI(`heroku config:get DATABASE_URL -a #{app}`)
    entry = "*:5432:#{uri.path.gsub /\//, ''}:#{uri.user}:#{uri.password}"

    `echo '#{entry}' > ~/.pgpass; chmod 0600 ~/.pgpass`
  end
end

I was unaware of the usefulness of the grave ` when using commands like this. Very cool