# File lib/openshift-origin-controller/app/models/application.rb, line 1415
  def group_instances
    @group_instance_map = {} if @group_instance_map.nil?
    values = @group_instance_map.values.uniq
    keys   = @group_instance_map.keys

    values.each do |group_inst|
      group_inst.reused_by = keys.clone.delete_if{ |k| @group_instance_map[k] != group_inst }
    end

    values
  end