ActiveAdmin rails-settings-cached

preference.rb

ActiveAdmin.register_page "Preference" do
  menu priority: 2
  content do

    panel "Preference" do
      form :action => admin_preference_update_path, :method => :post do |f|
        fieldset do
          ol do
            li do
              label 'dfg'
              f.input :name => 'key', :type => 'text'
            end
          end
        end
      end
    end









  end

  page_action :update, :method => :post do
    asdf
    Preference[params[:key]] = params[:val]
    redirect_to :back, :notice => "#{params[:key]} added"
  end
end