code: def populateFromRow(self, quantificationSetRecord):
          
          self._dbFilePath = quantificationSetRecord.dataurl
          self.setAttributesJson(quantificationSetRecord.attributes)
          self._db = SqliteRnaBackend(self._dbFilePath)
          self.addRnaQuants()
docs: Populates the instance variables of this RnaQuantificationSet from the
          specified DB row.