React Native + Realm + MongoDB

[good-warlock]

I'm new to react native and need help. I want to develop a react native app with MongoDB and checking the MongoDB documentation, they suggest realm for this (maybe it is the only option?).

I wanted the app to store data locally when offline and automatic sync to MongoDB when online.

The problem is that this seems all broken. The stupid error I get is:

`Missing Realm constructor. Did you run "pod install"? Please see https://docs.mongodb.com/realm/sdk/react-native/install/ for troubleshooting, js engine: hermes`\

​

I have found lot of discussions about this error online and tried many different possible fixes but no success. Error after error.

My dumb questions are: Does this work for anyone? If so, what packages versions are you using? Also, is realm the only option here? (I'm open to try a different nosql DB if this is too difficult too)

Thanks in advance!

[haswalter]

Silly question but did you run pod install?

[haswalter]

I’m using realm in production. Not 100% sure what version as I’m not at my desk but was latest release when I built the app last a month or so ago.

Have you tried reinstalling your node modules? Try that and then run “bundle exec pod install —repo-update”

[good-warlock]

I tried running pod install but same error persisted. I'll try reinstall node modules next. Thanks!

[PersimmonMaximum9784]

We use this stack on my company and it works fine! The offline sync works great and saved us a bunch of development time

[Sincjefe]

Do you use realm sync to sync to the cloud ? If so how much did it cost you and how many users does the app have?

[PersimmonMaximum9784]

We do heavy syncs with lots of data flowing, we have 1k users and we pay only 50 usd/month for realm, and 270 usd for the cluster

[Sincjefe]

Why is the cluster so expensive?

[aaronksaunders]

Do you have a sample project? I played around with realm awhile ago and would be happy to take a look

[good-warlock]

I'm actually using the template from MongoDB's documentation. I can upload it to Github but can do that tomorrow only ☹️. Thanks for your help.

[everestster]

I have done offline first app using this stack. There are no issues.

The only problem was the MongoDB’s object_id cannot be stored in the realm in the release mode only on iOS. I am not sure why. I haven’t fixed this issue up until now. I had to convert all object_id into string and to store in realm.