Goals

Being able to create a class model two times

Expected Results

Two models are written to the realm.

Actual Results

The first one is successfully written, the second one throws the following exception:

Steps to Reproduce

Given the following class model (typescript) :

export default class Transaction extends Realm.Object {
    name: string;
    date: Date;
    value: number;
    _id?: string;

    constructor(name: string, date: Date, value: number) {
        super();
        
        this._id = new ObjectId().toHexString();
        this.name = name;
        this.date = date;
        this.value = value;
    }

    static schema: Realm.ObjectSchema = {
        name: 'Transaction',
        primaryKey: '_id',
        properties: {
            _id: 'string',
            name: 'string',
            date: 'date',
            value: 'int'
        }
    };
}

Here's how I setup realm:

const realm = new Realm({schema: [Transaction]});

When I add my first transaction like this:

realm?.write(() => {
    realm.create(
        Transaction,
        new Transaction(
            "Coffee",
            new Date(),
            35
        )
    );
});

The first time, everything works as expected, but when I call this code a second time, the app crashes with the exception above.

Ideally I would want to automatically generate an id in my model, so I don't have to duplicate code ( I also need a created_at, updated_at, and I don't want to specify those everytime I create a new object ).

I think the bug is around this line: https://github.com/realm/realm-js/blob/e67a78bb5ad32245a2b531d73ed80baa9570e2a4/src/jsc/jsc_class.hpp#L733

Side note: I wanted to fix the issue myself but wasn't able to compile realm myself. The tests seem to use a private docker repository that I cannot clone

Version of Realm and Tooling

• Realm JS SDK Version: 10.2.0
• Node or React Native: React Native
• Client OS & Version: 0.63
• Which debugger for React Native: None