Firestore transactions in flow

[rsallar]

Hello everyone. Do you know how to convert firestore transactions to flow?

async whatever(value: number) {
       await this.db.runTransaction(async transaction => {
            const doc= await transaction.get(this.taleDB.doc());
            ...
        });
}

[urugator]

this.db.runTransaction(flow(function*(transaction) {
  const doc = yield transaction.get(this.taleDB.doc());
  ...
}));

??

[rsallar]

It worked wonderfully! I have a new use case. listening to db changes with onSnapshot. It only works once but subsequent changes in db are not triggered. With Async/Await it works.

const unsub = yield this.db.onSnapshot(flow(function*(snap){
            snap.docChanges().forEach((change) => {
                if(change.type!=="removed"){
                    console.log(change.doc.data());
                }                
            });
        }));    
 }

[rsallar]

Found it, there's no need for the first yield as onSnapshot is not an async function.

[urugator]

The callback passed to onSnapshot isn't async either - replace the flow with action (in case there are some state mutations).