gistfile1.rb

class ShardingMiddleware
  def initialize(app)
    @app = app
  end
  
  def call(env)
    env['warden'].authenticate!
    repo_name = env['warden'].account.repository_name
    
    result = nil
    
    DataMapper.repository(repo_name) do
      result = @app.call(env)
    end

    result
  end
end