code: def from_metadata(self, db_path, db_name='engine_metadata.db'):
          
  
          self.__engine.fromMetadata(db_path, db_name)
          return self
docs: Registers in the current session the views of the MetadataSource so the
          data is obtained from the metadata database instead of reading the
          repositories with the DefaultSource.
  
          :param db_path: path to the folder that contains the database.
          :type db_path: str
          :param db_name: name of the database file (engine_metadata.db) by default.
          :type db_name: str
          :returns: the same instance of the engine
          :rtype: Engine