title: TypeError: 'MotorCollection' object is not callable in motor python
body: <pre><code>#!/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()
  </code></pre>
  
  <p>I am  trying to send the websocket   object  on on_open  function to client
  and it  return  the id along with object with  it,
  but it says error:TypeError: 'MotorCollection' object is not callable in json.encode(self)
  please help</p>