非Rails環境でActiveRecordのマイグレーションを利用するRakefileのひな形

Rakefile

require 'active_record'
require 'logger'
 
task :default => 'db:migrate'
 
namespace :db do
  MIGRATIONS_DIR = "db/migrate"
 
  desc "Migrate the database"
  task :migrate => :environment do
    ActiveRecord::Migrator.migrate(MIGRATIONS_DIR, ENV["VERSION"] ? ENV["VERSION"] : nil)
  end
 
  desc "Roll back the database schema to the previous version"
  task :rollback => :environment do
    ActiveRecord::Migrator.rollback(MIGRATIONS_DIR, ENV["STEP"] ? ENV["STEP"] : 1)
  end
 
  task :environment do
    ActiveRecord::Base.establish_connection(YAML.load(File.open('config/database.yml')))
    ActiveRecord::Base.logger = Logger.new(File.open('log/migration.log', 'a'))
  end
end

参考情報

• 非Railsの環境でActiveRecordのマイグレーションを利用する方法 | prime factor