bsw@241: Unit = mondelefant.new_class()
bsw@241: Unit.table = 'unit'
bsw@241: 
bsw@241: Unit:add_reference{
bsw@241:   mode          = '1m',
bsw@241:   to            = "Area",
bsw@241:   this_key      = 'id',
bsw@241:   that_key      = 'unit_id',
bsw@241:   ref           = 'areas',
bsw@241:   back_ref      = 'unit'
bsw@241: }
bsw@241: 
bsw@241: function Unit:get_flattened_tree()
bsw@241:   -- TODO implement
bsw@241: 
bsw@241:   return Unit:new_selector():exec()
bsw@241: end