docs: def fetch_by_relname(self, name):
          """ Construct DataFrame with component data from filtered table data.
  
          Parameters
          ----------
          name : str
              Component name.
  
          Returns
          -------
          pd.DataFrame
              Component data.
          """
  
          ormclass = self._mapped[name]
          query = self.session.query(ormclass)
  
          if name != carr_ormclass:
  
              query = query.filter(
                  ormclass.scn_name == self.scn_name)
  
          if self.version:
              query = query.filter(ormclass.version == self.version)
  
          # TODO: Naming is not consistent. Change in database required.
          if name == 'Transformer':
              name = 'Trafo'
  
          df = pd.read_sql(query.statement,
                           self.session.bind,
                           index_col=name.lower() + '_id')
          if name == 'Link':
              df['bus0'] = df.bus0.astype(int)
              df['bus1'] = df.bus1.astype(int)
  
          if 'source' in df:
              df.source = df.source.map(self.id_to_source())
  
          return df