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ViewsSchedule cloud function to update a list of maps
I'm trying to write a scheduled cloud function to reset the value of "status" every day at 12 am. Here's my firestore structure:
I haven't really tried coding in javascript before but here's what I managed with my little knowledge:
const functions = require("firebase-functions");
const admin = require("firebase-admin");
admin.initializeApp();
const database = admin.firestore();
exports.Rst = functions.pubsub.schedule("0 0 * * *").onRun((context) => {
const alist =
database.collection("SA1XAoC2A7RYRBeAueuBL92TJEk1")
.doc("afternoon").get().then((snapshot)=>snapshot.data["list"]);
for (let i=0; i<alist.length; i++) {
alist[i]["status"]=0;
}
database.collection("SA1XAoC2A7RYRBeAueuBL92TJEk1")
.doc("afternoon").update({
"list": alist,
});
return null;
});
I get the following error when I deploy this function:
Expected Result:
Set the values of all "status" fields to 0.
2 answers
Answer question0
Your alist will return a Promise { <pending> }. It needs to be fulfilled with a value or rejected with a reason (error). You should use the .then method to fulfill or use the .catch method to get any errors of all the pending promises. See code below for reference:
const collectionName = "SA1XAoC2A7RYRBeAueuBL92TJEk1";
const documentName = "afternoon";
// created a reference to call between functions
const docRef = database.collection(collectionName).doc(documentName);
// Initialized a new array that will be filled later.
const tasks = [];
// Gets the data from the document reference
docRef.get()
// Fulfills the promise from the `.get` method
.then((doc) => {
// doc.data.list contains the array of your objects. Looping it to construct a `tasks` array.
doc.data().list.forEach((task) => {
// Setting the status to 0 for every object on your list
task.status = 0;
// Push it to the initialized array to use it on your update function.
tasks.push(task);
})
docRef.update({
// The `tasks` structure here must be the same as your Firestore to avoid overwritten contents. This should be done as you're updating a nested field.
list: tasks
}, { merge: true });
})
// Rejects the promise if it returns an error.
.catch((error) => {
console.log("Error getting document:", error);
});
I left some comments on the code for better understanding.
You may also wanna check these documentations:
0
It seems that alist is an object that Firestore can't handle. To get rid of any of the parts that Firestore can't handle, you can do:
database.collection("SA1XAoC2A7RYRBeAueuBL92TJEk1")
.doc("afternoon").update({
"list": JSON.parse(JSON.stringify(alist)) // 👈
});