UnhandledPromiseRejectionWarning: Error: cyclic dependency detected

[JoaoBM1]

Hey!

Im currently running into a "UnhandledPromiseRejectionWarning: Error: cyclic dependency detected" when setting up connect-mongo.

Here is my current code:

var session = require("express-session");
var MongoStore = require('connect-mongo')(session);

mongoose.connect("mongodb+srv://x:x@cluster0-anqkh.mongodb.net/H2Oil?retryWrites=true");

app.use(session({
  secret: 'keyboard cat',
  resave: false,
  store: new MongoStore({ mongooseConnection: mongoose.connection }),
  saveUninitialized: false
}));

As for the error logged in the console:

(node:11984) UnhandledPromiseRejectionWarning: Error: cyclic dependency detected
at serializeObject (C:\Users\João\Desktop\GitHub\Web_Project_F-J\node_modules\bson\lib\bson\parser\serializer.js:331:34)
at serializeInto (C:\Users\João\Desktop\GitHub\Web_Project_F-J\node_modules\bson\lib\bson\parser\serializer.js:934:17)
at serializeObject (C:\Users\João\Desktop\GitHub\Web_Project_F-J\node_modules\bson\lib\bson\parser\serializer.js:345:18)
at serializeInto (C:\Users\João\Desktop\GitHub\Web_Project_F-J\node_modules\bson\lib\bson\parser\serializer.js:934:17)
at serializeObject (C:\Users\João\Desktop\GitHub\Web_Project_F-J\node_modules\bson\lib\bson\parser\serializer.js:345:18)
at serializeInto (C:\Users\João\Desktop\GitHub\Web_Project_F-J\node_modules\bson\lib\bson\parser\serializer.js:934:17)
at serializeObject (C:\Users\João\Desktop\GitHub\Web_Project_F-J\node_modules\bson\lib\bson\parser\serializer.js:345:18)
at serializeInto (C:\Users\João\Desktop\GitHub\Web_Project_F-J\node_modules\bson\lib\bson\parser\serializer.js:934:17)
at serializeObject (C:\Users\João\Desktop\GitHub\Web_Project_F-J\node_modules\bson\lib\bson\parser\serializer.js:345:18)
at serializeInto (C:\Users\João\Desktop\GitHub\Web_Project_F-J\node_modules\bson\lib\bson\parser\serializer.js:934:17)
at serializeObject (C:\Users\João\Desktop\GitHub\Web_Project_F-J\node_modules\bson\lib\bson\parser\serializer.js:345:18)
at serializeInto (C:\Users\João\Desktop\GitHub\Web_Project_F-J\node_modules\bson\lib\bson\parser\serializer.js:934:17)
at serializeObject (C:\Users\João\Desktop\GitHub\Web_Project_F-J\node_modules\bson\lib\bson\parser\serializer.js:345:18)
at serializeInto (C:\Users\João\Desktop\GitHub\Web_Project_F-J\node_modules\bson\lib\bson\parser\serializer.js:934:17)
at serializeObject (C:\Users\João\Desktop\GitHub\Web_Project_F-J\node_modules\bson\lib\bson\parser\serializer.js:345:18)
at serializeInto (C:\Users\João\Desktop\GitHub\Web_Project_F-J\node_modules\bson\lib\bson\parser\serializer.js:934:17)
(node:11984) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). (rejection id: 1)
(node:11984) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.

Hope you can help. Thanks!

[adriantombu]

Same problem here since I switched to a mongodb+srv:// URI.

When I switch back to my old connexion in mongodb:// I don't get this error

[Seltiix]

Has anyone found a solution to this problem?

EDIT: I found that removing retryWrites=true fixed the issue for me

[mingchuno]

from mongodb doc:

The MongoDB version of every node in the cluster must be 3.6 or greater, and the featureCompatibilityVersion of each node in the cluster must be 3.6 or greater.

In the time of your writing, this library is not yet support mongodb 3.6.
We have added MongoDB 3.6 support in lastest commit and still waiting to publish

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.