for Casey

example.rb

class ApplicationController
  def require_login
    unless current_user
      session[:return_to] = request.uri
      redirect_to login_path
    end
  end
end

class LoginsController
  def create
    if user = User.authenticate(params[:username], params[:password])
      session[:current_user_id] = user.id
      redirect_to(session.delete(:return_to) || home_path)
    else
      render template: 'login'
    end
  end
end

class FlowLogsController
  before_filter :require_login
end