# File lib/lvm/volume_groups.rb, line 23
    def each 
      vgs = @vgs.list
      lvs = @lvs.list
      pvs = @pvs.list
      
      vgs.each do |vg|
        vg.logical_volumes  = lvs.select { |lv| lv.vg_uuid == vg.uuid }
        vg.physical_volumes = pvs.select { |pv| pv.vg_uuid == vg.uuid }
        yield vg
      end
    end