services.py

@user.get(accept=("application/json", "text/json"))
def get_user_json(request):
    db = request.db
    id = request.matchdict.get('name')
    user = db.query(User).filter(or_(
        User.id==id,
        User.name==id,
    )).first()

    if not user:
        request.errors.add('body', 'name', 'No such .')
        return

    return user.__json__()

@user.get(accept="text/html", renderer="services/user.html")
def get_user_html(request):
    return "user chrome"