Hello I want to update a field in a firebase document.
Right now , I am accessing the document collection like this However I am having trouble setting teh shares field of the doc to shares+=1 ? What am i doing wrong here in the set method?
const buyStock = async () => {
const q = await query(
collection(db, 'myStocks'),
where('ticker', '==', props.name)
);
const querySnapshot = await getDocs(q);
if (!querySnapshot.empty) {
// simply update the record
querySnapshot.forEach((doc) => {
doc.id.set({
shares: doc.id.data().shares+=1
})
// doc.data() is never undefined for query doc snapshots
console.log(doc, doc.id, ' => ', doc.data());
});
You're almost there. To update a document, you need a reference to that document. You can get this with:
querySnapshot.forEach((doc) => {
doc.ref.update({
shares: doc.data().shares+=1
})
});
You can also use the built-in atomic increment operator:
doc.ref.update({
shares: increment(1)
})
It looks like you are calling the set method on the 'id' field. Try to remove that. So just do
doc.set({
shares: doc.data().shares+=1
})
give that a shot. If that doesn't work, i'd try updating a document that is not part of a query snapshot.