gistfile1.rb

require 'rubygems'
require 'active_record'

desc 'migrate legacy table to add column'
namespace :document_manager do
  namespace :db do
    task :migrate do
      ActiveRecord::Base.clear_active_connections!
      configs = open('config/database.yml') { |f| YAML.load(f) }
      ActiveRecord::Base.logger = Logger.new(STDOUT) 
      ActiveRecord::Base.configurations = configs
      ActiveRecord::Base.establish_connection(ActiveRecord::Base.configurations['document_manager'][ENV['RAILS_ENV'] ])
      ActiveRecord::Base.connection.initialize_schema_migrations_table
      ActiveRecord::Migration.verbose = true
      ActiveRecord::Migrator.migrate("db/document_manager_migrate/", ENV["VERSION"] ? ENV["VERSION"].to_i : nil)
    end
  end
end