gistfile1.rbx

namespace :db do
  
  task :merb_start do
    Merb.start :adapter => 'runner', :environment => ENV['MERB_ENV'] || 'development', :log_file => Merb::Config[:log_file]
  end
  
  desc "Migrate the database through scripts in schema/migrations. Target specific version with VERSION=x"
  task :migrate => :merb_start do
    config = Merb::Orms::ActiveRecord.configurations[Merb.environment.to_sym]
    ActiveRecord::Base.establish_connection(config)
    ActiveRecord::Migrator.migrate("schema/migrations/", ENV["VERSION"] ? ENV["VERSION"].to_i : nil)
    Rake::Task["db:schema:dump"].invoke if ActiveRecord::Base.schema_format == :ruby
  end
end

gistfile2.txt