lotus_di_idea.rb

# register services
Application.register :session do
  SessionStore.new(store: Application.lookup(:database_store))
end

Application.register :database_store do
  # code to initialize database storage for session
end

# inject session service into every action
Application.inject('action', :session)

class Show
  include Lotus::Action
  
  before :authenticate
  
  def initialize(repository = Article)
    @repository = repository
  end

  def call(params)
    @article = @repository.find params[:id]
  end
  
  private
  def authenticate
    throw 401 unless session[:user_id]
  end
end