TypeError：'MotorCollection'对象在motor python中不可调用

Question

#!/usr/bin/python27
import tornado
import tornado.websocket
import tornado.wsgi
import motor
import json
import jsonpickle
from tornado.ioloop import IOLoop

class MainHandler(tornado.web.RequestHandler):
    def get(self):
        db = self.settings['db'] 
class ChatWebSocket(tornado.websocket.WebSocketHandler):
    clients = []
    ids={}
    def my_callback(result, error):
        print 'result', repr(result)
        IOLoop.instance().stop()
    def open(self):
        ChatWebSocket.clients.append(self)
        self.write_message(jsonpickle.encode(self))
    def on_message(self, message):
        def get_current_user(self):
        print(self)
        to=db.today.ensure_index()
        array=message
        data=json.loads(array)
        if  data['st']=='ty':
            for client in ChatWebSocket.clients:
                client.write_message('"me":"ty","con":'+data['whom']+' is  typing')
        elif (data['st']=='me'):
            print("ok")
        ChatWebSocket.ids[''+data['who']+'']=data['ob']
        for s in ChatWebSocket.ids:
            print(s)
        else: 
            doc={'who':data['who'],'whom':data['whom'],'mes':data['mes']}
            to.insert(doc,callback=my_callback)
            for client in ChatWebSocket.clients:
                client.write_message('"me":"ty","con":"'+data[mes]+'"')
    def on_close(self):
        ChatWebSocket.clients.remove(self)
db=motor.MotorClient().open_sync().chat 
tornado_app = tornado.web.Application([(r'/websocket', ChatWebSocket),
(r'.*', tornado.web.FallbackHandler), (r'/', MainHandler)],db=db)
tornado_app.listen(5069)
tornado.ioloop.IOLoop.instance().start()

我正在尝试将on_open函数上的websocket对象发送到客户端 它将id与对象一起返回， 但它说错误：TypeError：'MotorCollection'对象在json.encode中不可调用（self） 请帮忙