geoalchemy2 using geojson rather than wkb/wkt (wkbelement/wktelement)

gistfile1.py

import geoalchemy2, geoalchemy2.shape
import shapely.geometry

# Could use geomet rather than pushing this through shapely.
class Geometry(geoalchemy2.Geometry):
    """Deal in GeoJSON rather than WKB/WKT"""
    def result_processor(self, dialect, coltype):
        super_proc = super(Geometry, self).result_processor(dialect, coltype)
        def process(v):
            return v and shapely.geometry.mapping(
                geoalchemy2.shape.to_shape(super_proc(v)))

        return process

    def bind_processor(self, dialect):
        # Watch out. from_shape returns a wkb not a wkt, which
        # means geoalchemy2 doesn't apply the SRID.
        super_proc = super(Geometry, self).bind_processor(dialect)
        def process(v):
            return v and super_proc(
                geoalchemy2.shape.from_shape(shapely.geometry.shape(value))
                if isinstance(v, dict) else v)

        return process

thank for this great piece of code, but the deserialization part is not working well it gives me this error ProgrammingError: (psycopg2.ProgrammingError) can't adapt type 'WKBElement' [SQL: 'INSERT INTO person (name, point) VALUES (%(name)s, ST_GeomFromEWKT(%(point)s)) RETURNING person.id'] [parameters: {'name': u'TTTT', 'point': <WKBElement at 0x28f0b10; '01010000003cdba337dcc351c06d37c1374d374840'>}]
127.0.0.1 - - [19/Apr/2015 12:17:53] "POST /api/person HTTP/1.1" 400 -

bump.