Update an Item attribute

Users Dgraph
2

The answer is this

async function IncrementOrDecrementHashtagPins(
    hashtag: string,
    increment: boolean
): Promise<boolean> {
    // Hashtag.pinnedByCount: int .
    const txn = dgraphClient.newTxn({});
    try {
        const uid = await GetHashtagUid(hashtag);
        if (!uid) return false;
        const mutation = new dgraph.Mutation();
        if (increment) {
            mutation.setSetNquads(
                `<${uid}> <Hashtag.pinnedByCount> "1"^^<xs:int> .`
            );
        } else {
            mutation.setSetNquads(
                `<${uid}> <Hashtag.pinnedByCount> "-1"^^<xs:int> .`
            );
        }
        await txn.mutate(mutation);
        await txn.commit();
        return true;
    } catch (err) {
        return false;
    } finally {
        await txn.discard();
    }
}