I am struggling to get data out of the Firestore Cloud. The problem is that I have a function and inside it I have the data from the database, but I can't get it out of the function. I'll attach the code below.
function logBook(doc){
let names = doc.data().name;
console.log(names);
}
db.collection('flights').get().then((snapshot) =>{
snapshot.docs.forEach(doc => {
logBook(doc);
});
})
console.log(names);
Console output: https://prnt.sc/1bgrice
Thanks!
You are probably missing the fact that if you use then in a fucntion that it will leave the syncronous flow of the function and you can't return a result as you would expect it to.
Try a code like this:
function logBook(doc) {
let names = doc.data().name;
console.log(names);
}
async function getData() {
const result = [];
const snapshot = await db.collection("flights").get();
snapshot.docs.forEach((doc) => {
logBook(doc);
result.push(doc);
});
return result;
}
It is very importand here to undertand the async nature of the Firestore SDK.
The answer is much more simplier, than you think. You just have to declare a variable outside the function, than assign value to it inside the function. Something like this:
var globalVar;
function logBook(doc){
let names = doc.data().name;
globalVar = names;
console.log(names);
}
db.collection('flights').get().then((snapshot) =>{
snapshot.docs.forEach(doc => {
logBook(doc);
});
})
console.log(names);
Also if you assign a variable with the let keyword, it'll be scoped inside the function. I can recommend you this topic: What's the difference between using "let" and "var"?
(if you don't wanna spam stack with your starter questions, you can contact me on dc: vargaking#4200)
