docs: def get_unit_by_abbreviation(unit_abbreviation, **kwargs):
      """
          Returns a single unit by abbreviation. Used as utility function to resolve string to id
      """
      try:
          if unit_abbreviation is None:
              unit_abbreviation = ''
          unit_i = db.DBSession.query(Unit).filter(Unit.abbreviation==unit_abbreviation.strip()).one()
          return JSONObject(unit_i)
      except NoResultFound:
          # The dimension does not exist
          raise ResourceNotFoundError("Unit '%s' not found"%(unit_abbreviation))