Update for rails 7.0.X and handle postgres password

db.rake

# frozen_string_literal: true

# FORKED FROM: https://gist.github.com/amit/45e750edde94b70431f5d42caadee423
# SEE ALSO: https://gist.github.com/hopsoft/56ba6f55fe48ad7f8b90

# apt install postgresql-client
# apt-get -y install bash-completion wget
# wget --no-check-certificate --quiet -O - https://www.postgresql.org/media/keys/ACCC4CF8.asc | apt-key add -
# echo "deb http://apt.postgresql.org/pub/repos/apt/ `lsb_release -cs`-pgdg main" | sudo tee /etc/apt/sources.list.d/pgdg.list
# apt-get update
# apt-get -y install postgresql-client-12

namespace :db do
  desc 'Dumps the database to backups'
  task dump: :environment do
    dump_fmt = 'p' # 'c' or 'p', 't', 'd'
    dump_sfx = suffix_for_format dump_fmt
    backup_dir = backup_directory true
    cmd = nil
    with_config do |_app, host, db, user, passw|
      file_name = "#{Time.now.strftime('%Y%m%d%H%M%S')}_#{db}.#{dump_sfx}"
      # puts "app = #{app}"
      # puts "host = #{host}"
      # puts "db = #{db}"
      # puts "user = #{user}"
      # puts "Password = #{passw}"
      cmd = "PGPASSWORD=#{passw}  pg_dump -F #{dump_fmt} -v -U #{user} -h #{host} -d #{db} -f #{backup_dir}/#{file_name}"
    end
    puts cmd
    exec cmd
  end

  desc 'Show the existing database backups'
  task list: :environment do
    backup_dir = backup_directory
    puts backup_dir.to_s
    exec "/bin/ls -lt #{backup_dir}"
  end

  desc 'Restores the database from a backup using PATTERN'
  task :restore, [:pat] => :environment do |_task, args|
    if args.pat.present?
      cmd = nil
      with_config do |_app, _host, _db, _user, _passwd|
        backup_dir = backup_directory
        files = Dir.glob("#{backup_dir}/*#{args.pat}*")
        case files.size
        when 0
          puts "No backups found for the pattern '#{args.pat}'"
        when 1
          file = files.first
          fmt = format_for_file file
          if fmt.nil?
            puts "No recognized dump file suffix: #{file}"
          else
            cmd = "pg_restore -F #{fmt} -v -c -C #{file}"
          end
        else
          puts "Too many files match the pattern '#{args.pat}':"
          puts " #{files.join('\n ')}"
          puts 'Try a more specific pattern'
        end
      end
      unless cmd.nil?
        Rake::Task['db:drop'].invoke
        Rake::Task['db:create'].invoke
        puts cmd
        exec cmd
      end
    else
      puts 'Please pass a pattern to the task'
    end
  end

  private

  def suffix_for_format(suffix)
    { c: :dump, p: :sql, t: :tar, d: :dir }[suffix.to_sym].to_s
  end

  def format_for_file(file)
    case file
    when /\.dump$/ then 'c'
    when /\.sql$/  then 'p'
    when /\.dir$/  then 'd'
    when /\.tar$/  then 't'
    end
  end

  def backup_directory(create = false)
    backup_dir = Rails.root.join('/db/backups')
    if create && !Dir.exists?(backup_dir)
      puts "Creating #{backup_dir} .."
      Dir.mkdir(backup_dir)
    end
    backup_dir
  end

  def with_config
    yield Rails.application.class.module_parent_name.underscore,
      ActiveRecord::Base.connection_db_config.host,
      ActiveRecord::Base.connection_db_config.database,
      ActiveRecord::Base.connection_db_config.configuration_hash[:username],
      ActiveRecord::Base.connection_db_config.configuration_hash[:password]
  end
end

usage.sh

# Place the db.rake file in RAILS_ROOT/lib/tasks which will add the new tasks to the list of tasks.
# See the available tasks with `rails -T` or `rake -T` from the RAILS_ROOT directory

# dump the development db
rake db:dump

# dump the production db
RAILS_ENV=production rake db:dump

# dump the production db & restore it to the development db
RAILS_ENV=production rake db:dump
rake db:restore

# note: config/database.yml is used for database configuration,
#       but you will be prompted for the database user's password