DeprecatedFormBufferSubstitute lib/active_admin/views/components/active_admin_form.rb

gistfile1.rb

 class DeprecatedFormBufferSubstitute
        def initialize(form)
          @form = form
        end
        def << (value)
          @form.text_node value.html_safe
        end
      end

      def form_buffers
        warn "DEPRECATION WARNING: 'form_buffers' is no longer needed."
        @form_buffers ||= [DeprecatedFormBufferSubstitute.new(self)]
      end
     end