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Merb::BootLoader.after_app_loads do
  # for the mailer - gmail
  Merb::Mailer.config = {
    :host => 'smtp.gmail.com',
    :port => '587',
    :user => 'your_name@your_domain',
    :pass => 'your_pass',
    :auth => :plain, # :plain, ;login, :cram_md5
    :domain => "your_domain"
  }

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    def send_email()
      begin
        mailer = Merb::Mailer.new(
          :from => 'your from',
          # hack: Net::SMTP.send_message does not send msg to cc
          :to => 'your_to list',
          :subject => 'your subject',
          :text => 'content')
        mailer.deliver!
      rescue => exception

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  class Mailer
    # Sends the mail using SMTP.
    def net_smtp
      Net::SMTP.enable_tls(OpenSSL::SSL::VERIFY_NONE)
      Net::SMTP.start(config[:host], config[:port].to_i, config[:domain],
                      config[:user], config[:pass], config[:auth]) { |smtp|
        smtp.send_message.....
      }
    end
  end

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  ...
  def self.available_controllers(name)
    roles = Role.all(:name => name, :authorizable_type.not => nil)
    exists_controllers = roles.collect{|r| r.authorizable_type}
    controllers = Application.subclasses_list.to_a.sort
    controllers - exists_controllers
  end

  def authorizable_class
    return nil if authorizable_type.nil?

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  #Role.rb
  ...
  def authorizable_class
    return nil if authorizable_type.nil?
    klass = begin
      authorizable_type.split("::").inject(Object){|x, y| x.const_get(y)}
    rescue NameError => e
      msg = "Class not found: `#{authorizable_type}'"
      Merb.logger.warn!(msg)
      nil

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# DM 0.9.9
users = User.all
names = users.collect{|u| u.first_name}
names.uniq # works well, return all the names
names.uniq! # diff from MRI: return nil

# MRI
a = [1, 2, 3, 1, 2]
a.uniq #[3]
puts a #[1, 2, 3, 1, 2]

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class Employee
  include DataMapper::Resource

  property :id, Serial
  property :name, String
  ...
end

class Manager < Employee
  property :position, String, :default => 'manager'

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1. Set the mysql bin path if you installed it by yourself in /usr/local/mysql
  #you have to set your mysql bin on your path:
  PATH=$PATH:/usr/local/mysql/bin 

2. Remove the default mysql executable files
  $ sudo mv /usr/bin/mysql_config usr/bin/mysql_config.old
  $ sudo mv /usr/bin/mysql usr/bin/mysql

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sudo gem install do_mysql -- --with-mysql-config=/usr/local/mysql/bin/mysql_config

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install do-mysql
Installing do_mysql-0.9.11
Building native extensions.  This could take a while...
ERROR: Failed to build gem native extension.

/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/bin/ruby extconf.rb merb:gem:install
checking for mysql.h... no
checking for main() in -lmysqlclient... no
checking for mysql_query()... no
checking for mysql_ssl_set()... no