def related_field_name(self) -> str:
        """
        On first access calculates the name of the related field, later stored in
        _related_field_name property.

        :return: name of the related field
        :rtype: str
        """
        if self._related_field_name:
            return self._related_field_name
        owner_field = self._owner.ormar_config.model_fields[self.field_name]
        self._related_field_name = owner_field.get_related_name()

        return self._related_field_name

        On first access calculates the name of the related field, later stored in
        _related_field_name property.

        :return: name of the related field
        :rtype: str
        
ormar/relations/relation_proxy.py