ordering associations on rails
 I have a model called Payment that has many ChargeEvent s.  they are shown on Rails Admin, but totally out of order  
I tried configure with
  config.model 'BTR::Order' do
    show do
      include_all_fields
      field :charge_events do
        orderable :true
      end
    end
    edit do
      include_all_fields
    end
  end
 and with sortable , sort_by (that failed).  The documentation is scattered through github wiki pages and I couldn't find anything.  
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