ActiveAdmin how to do a simple select dropdown

link_to_picture.txt

https://cl.ly/70b58bd4605d/Image%202019-02-20%20at%201.55.28%20PM.png

subscriber.rb

  panel "Send Chat Message" do
      form action: "/admin/subscribers/#{resource.id}/send_message", method: :post do |f|
        div do
          f.select 'Bot', :bot_id, :collection => resource.bots.collect {|bot| [bot.name, bot.id]}
        end
        div do
          f.text_area :text, nil, as: :text, placeholder: 'Enter your text message'
        end
        div do
          f.input :submit, type: :submit
        end
      end
    end