Rakefile

APP_ROOT = File.dirname(File.expand_path(__FILE__))

CONFIG_FILE = File.join(APP_ROOT, "db", "config.yml")
MIGRATIONS_DIR = File.join(APP_ROOT, "db", "migrate")

namespace :db do
  require "activerecord"

  task :environment do
    config = YAML.load_file(CONFIG_FILE)
    environment = ENV["env"] ? ENV["env"] : "development"
    
    ActiveRecord::Base.establish_connection(config[environment])
    ActiveRecord::Base.logger = Logger.new(STDOUT)    
  end
  
  desc "Migrate the database"
  task :migrate => :environment do
    version = ENV["v"].to_i if ENV["v"]
    
    ActiveRecord::Migrator.migrate(MIGRATIONS_DIR, version)
  end  
end