code: def relation_column(instance, fields):
      '''
      such as: user.username
      such as: replies.content
      '''
      relation = getattr(instance.__class__, fields[0]).property
      _field = getattr(instance, fields[0])
      if relation.lazy == 'dynamic':
          _field = _field.first()
      return getattr(_field, fields[1]) if _field else 'f relation_column(instance, fields):
      '''
      such as: user.username
      such as: replies.content
      '''
      relation = getattr(instance.__class__, fields[0]).property
      _field = getattr(instance, fields[0])
      if relation.lazy == 'dynamic':
          _field = _field.first()
      return getattr(_field, fields[1]) if _field else ''
docs: such as: user.username
      such as: replies.content