mm-data_mapper

mm-data_mapper is a plugin for MonkeyMailer which allows using a DataMapper model as the datasource.
It requires that you configure your database settings inside MonkeyMailer.configuration.loader_options using DataMapper's configuration options:

MonkeyMailer.configure do |config|
  config.loader = MonkeyMailer::Loaders::DataMapper
  config.loader_options = {
    :default => {
      :adapter => 'mysql',
      :user => 'monkey-mailer',
      :password => 'monkey_mailer_dev',
      :database => 'monkey_mailer_test'
    }
  }
end

Note that you will need to have the adapter gem installed in your system (dm-mysql-adapter in this case)

See the UNLICENSE file included with this gem distribution.