I have a user collection and I'm trying to search if the first and last name exists and if not, I just want to put a display message that it does not exist. I tried this but it does not work, it will run the catch phrase.
async function readUser() {
try {
const q = query(
collection(db, "users"),
where("firstName", "==", firstName),
where("lastName", "==", lastName)
);
const docSnap = await getDoc(q);
if (docSnap.exists()) {
console.log("Document data:", docSnap.data());
} else {
// doc.data() will be undefined in this case
console.log("No such document!");
}
} catch (err) {
console.log("cannot add user");
}
}
First, if you are executing a query you should use getDocs(). The getDoc() is used to fetch a single document only. You'll then get a QuerySnapshot that does not have a exists property. If you can instead check if the query returned an empty response (i.e. no matching document) using empty property. Try refactoring the document as shown below:
async function readUser() {
try {
const q = query(
collection(db, "users"),
where("firstName", "==", firstName),
where("lastName", "==", lastName)
);
const querySnap = await getDocs(q);
if (querySnap.empty) {
console.log("No matching document, name available");
} else {
console.log("Name found", querySnap.docs.map((d) => d.data()));
}
} catch (err) {
console.log("cannot add user");
}
}