I have a function that should check if an entry in db exists based on an input ID.
If yes, update the entry, else create a new entry.

I am assinging either updateOne or create to a const, and then calling it later on.
But when I run this it gets me this error:
“MongooseError: Model.create() cannot run without a model as this.”

export async function dbUpdateWishlist(wl: wishlistDBType): Promise<BoolTuple> {
    const queryFn =
        (await WishlistModel.exists({
            discordIdentifier: wl.discordIdentifier,
        })) !== null
            ? WishlistModel.updateOne
            : WishlistModel.create;

    const response = await queryFn(wl)
        .then(() => {
            return [true, 'DB save successful'];
        })
        .catch((err: Error) => {
            console.log('DB save failed ', err);
            return [false, 'DB save failed'];
        });

    return response as BoolTuple;
}

I can (and have successfully) run the conditional in an If statement and then duplicate the response code in both if and else block. I am trying to avoid repeating code.
Working option:

export async function dbUpdateWishlist(wl: wishlistDBType): Promise<BoolTuple> {
    let response;
    if (
        (await WishlistModel.exists({
            discordIdentifier: wl.discordIdentifier,
        })) !== null
    ) {
        // If exists then update.
        response = await WishlistModel.updateOne(wl)
            .then(() => {
                return [true, 'DB save successful'];
            })
            .catch((err: Error) => {
                console.log('DB save failed ', err);
                return [false, 'DB save failed'];
            });
    } else {
        // Otherwise create a new entry.
        response = await WishlistModel.create(wl)
            .then(() => {
                return [true, 'DB save successful'];
            })
            .catch((err: Error) => {
                console.log('DB save failed ', err);
                return [false, 'DB save failed'];
            });
    }

    return response as BoolTuple;
}

(I am aware the return tuples are not doing much for this function, but they are conforming to the rest of the application.)