gistfile1.rbx

# This file is specifically for you to define your strategies 
#
# You should declare you strategies directly and/or use 
# Merb::Authentication.activate!(:label_of_strategy)
#
# To load and set the order of strategy processing

Merb::Slices::config[:"merb-auth-slice-password"][:no_default_strategies] = true

module Merb::Authentication::Strategies
   class UserAuthentication < Merb::Authentication::Strategy
     def run!
       if params[:username] and params[:password]
         user = User.auth(params[:username], params[:password])
         if !user
           request.session.authentication.errors.add('username',
                                                     "Brukernavn og/eller password var feil")
         end
         user
       end
     end
   end
end

setup.rb

Merb::Plugins.config[:"merb-auth"][:login_param]    = :username 

strategies.rb

# This file is specifically for you to define your strategies 
#
# You should declare you strategies directly and/or use 
# Merb::Authentication.activate!(:label_of_strategy)
#
# To load and set the order of strategy processing

Merb::Slices::config[:"merb-auth-slice-password"][:no_default_strategies] = true

Merb::Authentication.activate!(:default_password_form)

module Merb::Authentication::Strategies
   class Basic::Form < Basic::Base
     def strategy_error_message
       "Brukernavn og/eller password var feil"
     end
   end
end