NodeJs MongoDBとHeroku

Question

NodeアプリケーションをHerokuにデプロイするときに、次のエラーメッセージが表示されます。それを引き起こす原因は何か？

1. 2016-09-19T09:44:06.497018+00:00 app[web.1]: "stack": [
2. 2016-09-19T09:44:06.497020+00:00 app[web.1]: "TypeError: options.mongooseConnection.once is not a function",
3. 2016-09-19T09:44:06.497021+00:00 app[web.1]: " at MongoStore (/app/node_modules/connect-mongo/src/index.js:91:48)",
4. 2016-09-19T09:44:06.497021+00:00 app[web.1]: " at Object. (/app/app/session/index.js:14:17)",
5. 2016-09-19T09:44:06.497022+00:00 app[web.1]: " at Module._compile (module.js:413:34)",
6. 2016-09-19T09:44:06.497022+00:00 app[web.1]: " at Object.Module._extensions..js (module.js:422:10)",
7. 2016-09-19T09:44:06.497023+00:00 app[web.1]: " at Module.load (module.js:357:32)",
8. 2016-09-19T09:44:06.497023+00:00 app[web.1]: " at Function.Module._load (module.js:314:12)",
9. 2016-09-19T09:44:06.497024+00:00 app[web.1]: " at Module.require (module.js:367:17)",
10. 2016-09-19T09:44:06.497024+00:00 app[web.1]: " at require (internal/module.js:20:19)",
11. 2016-09-19T09:44:06.497025+00:00 app[web.1]: " at Object. (/app/app/index.js:16:15)",
12. 2016-09-19T09:44:06.497025+00:00 app[web.1]: " at Module._compile (module.js:413:34)",
13. 2016-09-19T09:44:06.497026+00:00 app[web.1]: " at Object.Module._extensions..js (module.js:422:10)",
14. 2016-09-19T09:44:06.497027+00:00 app[web.1]: " at Module.load (module.js:357:32)",
15. 2016-09-19T09:44:06.497027+00:00 app[web.1]: " at Function.Module._load (module.js:314:12)",
16. 2016-09-19T09:44:06.497028+00:00 app[web.1]: " at Module.require (module.js:367:17)",
17. 2016-09-19T09:44:06.497028+00:00 app[web.1]: " at require (internal/module.js:20:19)",
18. 2016-09-19T09:44:06.497029+00:00 app[web.1]: " at Object. (/app/server.js:4:17)",
19. 2016-09-19T09:44:06.497029+00:00 app[web.1]: " at Module._compile (module.js:413:34)",
20. 2016-09-19T09:44:06.497030+00:00 app[web.1]: " at Object.Module._extensions..js (module.js:422:10)",
21. 2016-09-19T09:44:06.497030+00:00 app[web.1]: " at Module.load (module.js:357:32)",
22. 2016-09-19T09:44:06.497031+00:00 app[web.1]: " at Function.Module._load (module.js:314:12)",
23. 2016-09-19T09:44:06.497032+00:00 app[web.1]: " at Function.Module.runMain (module.js:447:10)",
24. 2016-09-19T09:44:06.497032+00:00 app[web.1]: " at startup (node.js:148:18)"
25. 2016-09-19T09:44:06.497033+00:00 app[web.1]: ],
26. 2016-09-19T09:44:06.497033+00:00 app[web.1]: "level": "error",
27. 2016-09-19T09:44:06.497034+00:00 app[web.1]: "message": "uncaughtException: options.mongooseConnection.once is not a function"
28. 2016-09-19T09:44:06.497035+00:00 app[web.1]: }

Answer 1

私はあなたがこのエラーを得ている理由ですcreateConnection方法とconnectないとマングースの接続を作成していると思います。あなたがonceメソッドを使用したい場合は

.createConnection() returns a Connection instance.

.connect() returns the global mongoose instance.

は、その後、あなたは代わりにconnect方法

var db = mongoose.createConnection('MongoDB URL'); 
db.once('open', function() { ... });