ActiveAdmin rails-settings-cached

preference.rb

ActiveAdmin.register_page "Preference" do
  menu priority: 2
  content do
    form_for Preference.new do |f|
      inputs "Details" do
        input :name => 'key'
        input :name => 'val'
      end
    end
    # panel "Preference" do
    # end



    panel "Preference" do
      table do
        thead do
          th 'Setting'
          th 'Value'
          th ''
        end
        Preference.get_all.each do |key, val|
          tr do
            td strong key
            td val
            td do
              link_to "delete", admin_preference_delete_path( :key => key ), :method => :post
            end
          end
        end
        tr do
          form :action => admin_preference_create_path, :method => :post do |f|
            f.input :name => 'authenticity_token', :type => :hidden, :value => form_authenticity_token.to_s
            td do
              f.input :name => 'key'
            end
            td do
              f.input :name => 'val'
            end
            td do
              f.input :type => 'submit', :value => 'Add'
            end
          end
        end
      end
    end
  end

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

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

  page_action :delete, :method => :post do
    Preference.destroy params[:key]
    redirect_to :back, :notice => "#{params[:key]} deleted"
  end
end