3
Sep 2020
11 / 11
Feb 2022
Feb 2022
Jerry_Wang
Sep 2020

Hi everyone!

I’m using Realm for the first time for a React Native (created via react-native init) project, and I’m a bit confused as to why new Realm.App({ id: appId }) produces an empty object {} despite passing in the correct appId.

I’ve installed Realm via yarn add realm@10.0.0-beta.9

If anyone has encountered this problem or has any advice, I’d definitely appreciate any suggestions. Thank you!

3
Pravin_kumar
Sep 2020

Same issue here. After analysis, I guess this is import issue where no modules from realm is actually imported. if I do import like

import Realm, {App} from 'realm';

and try creating app with

new App(appconfig);

throws undefined is not constructor.

Checked the source of realm, seems to be fine. but not mapping to declarations/exports ?

Pravin_kumar
Sep 2020

I have verified the official docs, git-hub docs. But no luck. I am stuck

Pravin_kumar
Sep 2020

“react”: “16.13.1”,
“react-native”: “0.63.2”,
“realm”: “^10.0.0-beta.12”

John_SaigleJohn
Sep 2020

I’ve found that it’s usually not possible to console.log ANY Realm objects.

For example if you authenticate for a realm app and get the user object back, you will not be able to print it.

e.g. something like
const user = app.loginAnonymous(Realm.Credentials.anonymous());

then
console.log(user); you will get {}. However if you do console.log(user.id) you will get a value.

This seems to be a known bug, see e.g. Improve the output from console.log of objects and collections on Node.js · Issue #2758 · realm/realm-js · GitHub

It’s unfortunately a pretty major issue. My workaround has been to go to the reference documentation for the SDK. Index

Note that this documentation is one version behind the latest release and the whole thing is in Beta.

Jerry_Wang
Sep 2020

@Pavel_Duchovny,

Thanks for getting back to me!

It looks like object has enumerable or hidden members?

Printing out the object after JSON.stringify-ing it results in an empty object, but I can call app.logIn() just fine. The user object app.logIn() produces is also empty {}, but logging user.id prints out a UUID string, so I’m not quite sure why printing the user object would show an empty object {}. Attempting to print the object’s keys and enumerable properties results in empty arrays, as well. Is this intended behavior?

Also, with regards to the app initialization – the typescript definitions seem like they don’t accept a “timeout” or “app” parameter, but including them doesn’t throw any errors or change any behavior from initial testing, so I’m not sure whether they’re required or not for React Native.

Hopefully these help others who are experiencing similar issues!

Pravin_kumar
Sep 2020

it is not about the empty object. The Realm.App constructor is not working. throws “undefined is not a constructor” error.

1 year later
Aviation_W_BAviation W&B
Feb 2022

Hi Jerry,

Im experiencing the same issue - can access the property but the objects seems empty.
Seems like mongoDB return the object with all properties non-enumerable.
Did you find a way to fix that ?


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