@classmethod
def map_back(cls, doc: dict) ->dict:
    """Map properties from MongoDB to OPTIMADE

        :param doc: A resource object in MongoDB format
        :type doc: dict

        :return: A resource object in OPTIMADE format
        :rtype: dict
        """
    type_ = doc['type']
    newdoc = super().map_back(doc)
    newdoc['type'] = type_
    return newdoc
