PyMongo - Erstellen Sie MongoClient mit connect = False, oder erstellen Sie einen Client nach dem Forking

Question

Ich entwickle Web App in der Flasche mit Mongodb (mLab). Nachdem es für Heroku Bereitstellung habe ich solche Fehler:

userWarning: MongoClient opened before fork. Create MongoClient with connect=False, or create client after forking.

ich diese Dokumentation, haben aber keine Ahnung, wie es mit meinem Code zu verwenden. http://api.mongodb.com/python/current/faq.html#using-pymongo-with-multiprocessing

Hier ist ein Teil meines Codes. Kann mir jemand zeigen, wie man MongoClient mit connect = False erstellt oder einen Client nach der Verzweigung erstellt?

from flask import Flask, render_template, url_for, request, session, redirect 
from flask_pymongo import PyMongo 


app = Flask(__name__) 

app.config['MONGO_DBNAME'] = 'connect_to_mongo' 
app.config['MONGO_URI'] = 'mongodb://admin:xxxxx@ds145148.mlab.com:45148/xxxxxx' 
mongo = PyMongo(app) 

@app.route('/companies', methods=['GET']) 
def showCompanies(): 
    if 'userName' not in session: 
     return redirect(url_for('start_page')) 
    mongoCompanies = mongo.db.companies 
    mLabCompanies = [x for x in mongoCompanies.find()] 
    return render_template('companies/companies.html', mLabCompanies=mLabCompanies) 

Log von Heroku:

2017-01-28T09:21:05.106084+00:00 heroku[router]: at=info method=GET path="/" host=hidden-crag-49839.herokuapp.com request_id=305240cf-6cb2-493d-8e07-22fac67c7fd4 fwd="89.75.75.183" dyno=web.1 connect=0ms service=5ms status=200 bytes=678 
2017-01-28T09:21:05.107723+00:00 app[web.1]: {address space usage: 400879616 bytes/382MB} {rss usage: 20213760 bytes/19MB} [pid: 11|app: 0|req: 3/3] 10.13.194.229() {50 vars in 910 bytes} [Sat Jan 28 09:21:05 2017] GET/=> generated 598 bytes in 4 msecs (HTTP/1.1 200) 2 headers in 80 bytes (1 switches on core 0) 
2017-01-28T09:21:09.940804+00:00 app[web.1]: /app/.heroku/python/lib/python2.7/site-packages/pymongo/topology.py:145: UserWarning: MongoClient opened before fork. Create MongoClient with connect=False, or create client after forking. See PyMongo's documentation for details: http://api.mongodb.org/python/current/faq.html#pymongo-fork-safe> 
2017-01-28T09:21:09.940813+00:00 app[web.1]: "MongoClient opened before fork. Create MongoClient " 
2017-01-28T09:21:39.931057+00:00 heroku[router]: at=error code=H12 desc="Request timeout" method=POST path="/login" host=hidden-crag-49839.herokuapp.com request_id=da7bb67b-9f1c-4e1c-84b6-cdfd131008dc fwd="89.75.75.183" dyno=web.1 connect=0ms service=30000ms status=503 bytes=0 
2017-01-28T09:21:40.136006+00:00 app[web.1]: [2017-01-28 09:21:40,132] ERROR in app: Exception on /login [POST] 
2017-01-28T09:21:40.136016+00:00 app[web.1]: Traceback (most recent call last): 
2017-01-28T09:21:40.136017+00:00 app[web.1]: File "/app/.heroku/python/lib/python2.7/site-packages/flask/app.py", line 1982, in wsgi_app 
2017-01-28T09:21:40.136018+00:00 app[web.1]:  response = self.full_dispatch_request() 
2017-01-28T09:21:40.136019+00:00 app[web.1]: File "/app/.heroku/python/lib/python2.7/site-packages/flask/app.py", line 1614, in full_dispatch_request 
2017-01-28T09:21:40.136020+00:00 app[web.1]:  rv = self.handle_user_exception(e) 
2017-01-28T09:21:40.136021+00:00 app[web.1]: File "/app/.heroku/python/lib/python2.7/site-packages/flask/app.py", line 1517, in handle_user_exception 
2017-01-28T09:21:40.136021+00:00 app[web.1]:  reraise(exc_type, exc_value, tb) 
2017-01-28T09:21:40.136022+00:00 app[web.1]: File "/app/.heroku/python/lib/python2.7/site-packages/flask/app.py", line 1612, in full_dispatch_request 
2017-01-28T09:21:40.136022+00:00 app[web.1]:  rv = self.dispatch_request() 
2017-01-28T09:21:40.136023+00:00 app[web.1]: File "/app/.heroku/python/lib/python2.7/site-packages/flask/app.py", line 1598, in dispatch_request 
2017-01-28T09:21:40.136024+00:00 app[web.1]:  return self.view_functions[rule.endpoint](**req.view_args) 
2017-01-28T09:21:40.136024+00:00 app[web.1]: File "./app.py", line 32, in login 
2017-01-28T09:21:40.136025+00:00 app[web.1]:  login_user = users.find_one({'userName' : request.form['loginUsername']}) 
2017-01-28T09:21:40.136026+00:00 app[web.1]: File "/app/.heroku/python/lib/python2.7/site-packages/pymongo/collection.py", line 1102, in find_one 
2017-01-28T09:21:40.136026+00:00 app[web.1]:  for result in cursor.limit(-1): 
2017-01-28T09:21:40.136027+00:00 app[web.1]: File "/app/.heroku/python/lib/python2.7/site-packages/pymongo/cursor.py", line 1114, in next 
2017-01-28T09:21:40.136028+00:00 app[web.1]:  if len(self.__data) or self._refresh(): 
2017-01-28T09:21:40.136029+00:00 app[web.1]: File "/app/.heroku/python/lib/python2.7/site-packages/pymongo/cursor.py", line 1036, in _refresh 
2017-01-28T09:21:40.136030+00:00 app[web.1]:  self.__collation)) 
2017-01-28T09:21:40.136030+00:00 app[web.1]: File "/app/.heroku/python/lib/python2.7/site-packages/pymongo/cursor.py", line 873, in __send_message 
2017-01-28T09:21:40.136031+00:00 app[web.1]:  **kwargs) 
2017-01-28T09:21:40.136032+00:00 app[web.1]: File "/app/.heroku/python/lib/python2.7/site-packages/pymongo/mongo_client.py", line 888, in _send_message_with_response 
2017-01-28T09:21:40.136033+00:00 app[web.1]:  server = topology.select_server(selector) 
2017-01-28T09:21:40.136034+00:00 app[web.1]: File "/app/.heroku/python/lib/python2.7/site-packages/pymongo/topology.py", line 214, in select_server 
2017-01-28T09:21:40.136034+00:00 app[web.1]:  address)) 
2017-01-28T09:21:40.136035+00:00 app[web.1]: File "/app/.heroku/python/lib/python2.7/site-packages/pymongo/topology.py", line 189, in select_servers 
2017-01-28T09:21:40.136035+00:00 app[web.1]:  self._error_message(selector)) 
2017-01-28T09:21:40.136036+00:00 app[web.1]: ServerSelectionTimeoutError: No servers found yet 
2017-01-28T09:21:40.140805+00:00 app[web.1]: {address space usage: 401403904 bytes/382MB} {rss usage: 20729856 bytes/19MB} [pid: 11|app: 0|req: 4/4] 10.13.194.229() {60 vars in 1125 bytes} [Sat Jan 28 09:21:09 2017] POST /login => generated 291 bytes in 30207 msecs (HTTP/1.1 500) 2 headers in 84 bytes (1 switches on core 0) 

Answer 1

Sie in der Verbindungs ​​Argument übergeben können:

app.config['MONGO_CONNECT'] = False 

das Verhalten in den Kommentaren oben umrissenen zu ermöglichen.

Ich untersuche gerade, ob dies das Standardverhalten sein sollte und ich werde die Bibliothek entsprechend aktualisieren, wenn ich das feststellen kann.