def unformat_geojson(self, feature):
        """
        This function should return a dictionary containing keys which maps
        to serializer fields.

        Remember that GeoJSON contains a key "properties" which contains the
        feature metadata. This should be flattened to make sure this
        metadata is stored in the right serializer fields.

        :param feature: The dictionary containing the feature data directly
                        from the GeoJSON data.
        :return: A new dictionary which maps the GeoJSON values to
                 serializer fields
        """
        attrs = feature["properties"]

        if 'geometry' in feature:
            attrs[self.Meta.geo_field] = feature['geometry']

        if self.Meta.bbox_geo_field and 'bbox' in feature:
            attrs[self.Meta.bbox_geo_field] = Polygon.from_bbox(feature['bbox'])

        return attrs
This function should return a dictionary containing keys which maps
        to serializer fields.

        Remember that GeoJSON contains a key "properties" which contains the
        feature metadata. This should be flattened to make sure this
        metadata is stored in the right serializer fields.

        :param feature: The dictionary containing the feature data directly
                        from the GeoJSON data.
        :return: A new dictionary which maps the GeoJSON values to
                 serializer fields