`undefined is not a function` when using useObject

How frequently does the bug occur?

All the time

Description

Hi ! I have a react-native project using "realm": "^11.1.0", "@realm/react": "^0.4.0" and "react-native": "0.70.4".

I’m using useObject to retrieve an object and it’s working fine until I try to access a property being an array of string.

Here’s what my code looks like

const ProjectComponent = () => {
    const { params: { projectId} } = useRoute();
    // Here project is { name: string, stringArray1: string[], stringArray2: string[], contracts: Contract[] }
    const project = useObject(Project, new Realm.BSON.ObjectId(projectId));
    const myString = project?.stringArray1?.[0] // The error happens here => undefined is not a function

Getting any project value works fine even getting elements inside contracts which is an array of contract objects but when trying to get elements inside stringArray1 or stringArray2 I get this error.

I looked at the stack trace and the problem seems to come from this line. In my case object is a string and object._objectKey is not defined.

It works when I shallow copy the array because it is not using the proxy anymore.

Please let me know if I’m using realm or react-realm incorrectly or if you need more informations.

Stacktrace & log output

Can you reproduce the bug?

Yes, always

Reproduction Steps

To reproduce create a model with a property being an array of strings

export class Project extends Realm.Object {
    _id;
    name;
    stringArray1;
    stringArray2;

    static schema = {
        name: "Project",
        properties: {
            _id: "objectId",
            name: "string",
            stringArray1: "string[]",
            stringArray2: { type: "string[]", default: [] },
        },
        primaryKey: "_id",
    };
}

And inside a react component, retrieve an element of the array of string from this object

const project = useObject(Project, _id);
const myString = project?.stringArray1?.[0]

Version

11.1.0 and 11.0.0

What SDK flavour are you using?

Atlas Device Sync

Are you using encryption?

No, not using encryption

Platform OS and version(s)

Android 12

Build environment

I’m using Windows 10 version 21H2 to emulate (emulator version 31.2.10) a Pixel 4 phone running on Android 12

[RenaudAubert]

@takameyer I confirm I no longer have an error thrown when accessing a value from an array of primitives. Thank you very much

[takameyer]

@RenaudAubert I can see the issue in our current implementation. We are checking of the property of an object is an instance of Realm.List. Seemed there was a false assumption that a Realm.List was a collection of Realm.Object. Therefore the code is trying to cache a list of primitives and assumes they are Realm.Objects.

We will look into this right away and update you here when a fix is available. Thanks for reporting this!