# File lib/ruote/util/filter.rb, line 262
    def _copy_from(field, value, matches, m, v)

      Ruote.set(@hash, field, Rufus::Json.dup(Ruote.lookup(@hash, v)))
      Ruote.unset(@hash, v) if m == 'move_from' or m == 'mv_from'

      nil
    end