understanding motor

import tornado.ioloop
import tornado.web
import logging
import motor

client = motor.MotorClient('mongodb://localhost:27017')
db = client.test_database

class MainHandler(tornado.web.RequestHandler):
    @tornado.web.asynchronous
    def get(self):
        db = self.settings['db']
        document = {'key': 'value'}
        self.write("hellno world")
        db.test_collection.insert(document, callback=self.my_callback)

    def my_callback(self, result, error):
        if error:
            logging.error("wtf")
        if result:
            repr(result)
        self.write("yea")
        tornado.ioloop.IOLoop.instance().stop()

application = tornado.web.Application([
    (r"/", MainHandler),
], db=db)

if __name__ == "__main__":
    application.listen(8888)
    tornado.ioloop.IOLoop.instance().start()

Remove the call to IOLoop.instance().stop(), since that terminates your application. When you want to quit the application just to Ctrl-C on your keyboard from the command line.

Instead, at the end of my_callback, call self.finish().

The rest of your code looks correct to me.

Thanks Jesse, I updated the code.

import tornado.ioloop
import tornado.web
import logging
import motor
import time

client = motor.MotorClient('mongodb://localhost:27017')
db = client.test_database

class MainHandler(tornado.web.RequestHandler):
    @tornado.web.asynchronous
    def get(self):
        db = self.settings['db']
        document = {'key': time.time()}
        self.write("hell-no world")
        db.test_collection.insert(document, callback=self.my_callback)

    def my_callback(self, result, error):
        if error:
            logging.error("wtf")
        if result:
            self.write(repr(result))
        self.finish()

application = tornado.web.Application([
    (r"/", MainHandler),
], db=db)

if __name__ == "__main__":
    application.listen(8888)
    tornado.ioloop.IOLoop.instance().start()