I am using Firebase functions for Firestore database. I am trying to update a field based on the new tweet being added.
Here is my Firebase Function on production:
const admin = require('firebase-admin')
admin.initializeApp()
const db = admin.firestore()
const functions = require("firebase-functions");
functions.logger.log("START OF FUNCTION");
exports.myFunction = functions.firestore
.document('timelines/{userId}/tweets/{tweetId}')
.onCreate((change, context) => {
const userId = context.params.userId
const tweetId = context.params.tweetId
functions.logger.log(context.params.userId);
functions.logger.log(context.params.tweetId);
db.doc(`/timelines/${userId}/tweets/${tweetId}`).update({likeCount: 200})
})
I am triggering it through an iPhone app. I am logged in to my account and I add a new Tweet. The Firebase function does get called but userId and tweetId are undefined. I am not sure why they are undefined. Any ideas?
Without knowing your client-side logic it's difficult to know if there are other issues. I would suggest adding some error handling to narrow down the cause. You could also try pulling it from the data response instead of context (assuming the schema matches).
Also note using 'snap' instead of 'change' as change is generally reserved for 'onWrite' and 'onUpdate' hooks.
exports.myFunction = functions.firestore
.document('timelines/{userId}/tweets/{tweetId}')
.onCreate(async (snap, context) => {
try {
const { userId, tweetId } = snap.data();
functions.logger.log(userId);
functions.logger.log(tweetId);
return await db.doc(`/timelines/${userId}/tweets/${tweetId}`).update({ likeCount: 200 });
}
catch (error) {
functions.logger.log(error);
}
});
Related
Let's say we have firebase project in which we have to use RTDB.
In RTDB we have created multiple databases.
I created a cloud trigger function i.e .onCreate so that my both databases get updated whenever I update any of two. When I am creating anything in default database it is working completely fine but when I am trying to update through other database (other than default one) it doesn't update default one. So could you please help me on this?
/* eslint-disable */
import * as functions from "firebase-functions";
import * as admin from "firebase-admin";
admin.initializeApp();
//this method is updating on creating data on database mentioned in instance id
export const newTest1=functions.database.instance('flysample-75b81-227ae').ref('/msg')
.onCreate((snapshot, context) => {
let app = admin.app();
app.database('https://flysample-75b81.firebaseio.com/').ref('/db1').set({Name:"Database1"})
app.database('https://flysample-75b81-227ae.firebaseio.com/').ref('/db1').set({Name:"Database1"})
return "done";
});
//this method is updating only by creating data on default database
export const newTest2=functions.database.ref('/msg')
.onCreate((snapshot, context) => {
let app = admin.app();
app.database('https://flysample-75b81.firebaseio.com/').ref('/db1').set({Name:"Database1"})
app.database('https://flysample-75b81-227ae.firebaseio.com/').ref('/db1').set({Name:"Database1"})
return "done";
});
//below 2 method works fine but i want to do this by single function
export const myFunTest1 = functions.database.instance('flysample-75b81').ref('/name')
.onCreate((snapshot, context) => {
let app = admin.app();
app.database('https://flysample-75b81.firebaseio.com/').ref('/db1').set({Name:"Database1"})
app.database('https://flysample-75b81-227ae.firebaseio.com/').ref('/db1').set({Name:"Database1"})
return "done";
});
export const myFunTest2 = functions.database.instance('flysample-75b81-227ae').ref('/name')
.onCreate((snapshot, context) => {
let app = admin.app();
app.database('https://flysample-75b81.firebaseio.com/').ref('/db1').set({Name:"Database1"})
app.database('https://flysample-75b81-227ae.firebaseio.com/').ref('/db1').set({Name:"Database1"})
return "done";
});
Your code is completely ignoring the asynchronous nature of writing to the database, which means there is no guarantee that any of the database writes completes before the instance gets terminated.
To ensure the writes don't get interrupted, wait for them to complete before returning a result with something like this:
export const newTest2=functions.database.ref('/msg')
.onCreate((snapshot, context) => {
let app = admin.app();
return Promise.all([
app.database('https://flysample-75b81.firebaseio.com/').ref('/db1').set({Name:"Database1"})
app.database('https://flysample-75b81-227ae.firebaseio.com/').ref('/db1').set({Name:"Database1"})
]).then(() => {
return "done";
});
});
So, I don't really know how to write JS, I am developing a mobile app in Flutter, and I would be grateful for some help and clarifications regarding Future/Promises in JS.
I got a collection of posts for each user, and I want to create an .onCreate function which when a user posts a new post (a new document is created inside the 'posts/userId/user_posts' collection), then it gets all the user's followers (from a collection 'user_followers/userUid') and for each follower, it writes the postUid and postOwnerUid to that follower's newsFeed collection ('user_news_feed/followerId').
This is what I got right now, but I am walking blind, since I really don't know JS and I don't know how can I await a write function while inside a get function.
And how do I prevent Cloud Timeouts? If for instance the user has 1000 followers, how can I prevent Firebase from shutting down my function and making sure all the followers are notified?
exports.writeToUserNewsFeed = functions.firestore
.document('posts/{userId}/user_posts/{postId}')
.onCreate((snap, context) => {
const postData = snap.data();
const postUid = postData['post_uid'];
const userUid = postData['user_uid'];
const postCreationDate = postData['post_creation_date'];
var docRef = db.collection('user_followers').doc(userUid).collection('followers');
docRef.get().then((querySnapshot) => {
querySnapshot.forEach((doc) => {
db.collection('user_news_feed')
.doc(doc.data['uid'])
.collection('feed')
.document(postUid)
.set({
'post_uid': postUid,
'user_uid': userUid,
'post_uid': postCreationDate,
});
});
});
});
As explained in the doc, in a background Cloud Function like an onCreate() for Firestore, you need to return a Promise when all the asynchronous work is completed. So in your case, one possibility is to use Promise.all() because you don't know upfront how many documents are in the followers subcollection. Since Promise.all() returns a single Promise you can include it in the Promise chain that you need to return in the Cloud Function.
exports.writeToUserNewsFeed = functions.firestore
.document('posts/{userId}/user_posts/{postId}')
.onCreate((snap, context) => {
const postData = snap.data();
const postUid = postData['post_uid'];
const userUid = postData['user_uid'];
const postCreationDate = postData['post_creation_date'];
var followersColRef = db.collection('user_followers').doc(userUid).collection('followers');
return followersColRef.get().then((querySnapshot) => { // <= See return here
const promises = [];
querySnapshot.forEach((doc) => {
promises.push(
db.collection('user_news_feed')
.doc(doc.data['uid'])
.collection('feed')
.doc(postUid)
.set({
'post_uid': postUid,
'user_uid': userUid,
'post_uid': postCreationDate,
})
);
});
return Promise.all(promises); // <= See return here
})
.catch(error => {
console.log(error);
return null;
})
});
Note that instead of using Promise.all() you could also use a batched write but there is a limit of 500 operations for a batched write.
I have multiple database instances in my firebase app. I am trying to write into three database instances in firebase cloud functions. My understanding by following this document is no need to initialize multiple apps for each database instance. We can initialize one and pass in the database url. As a side note, I have another function with similar kind of functionality where I have trigger event in one database and write data to other database instance and it works fine.
import * as functions from "firebase-functions";
import * as admin from "firebase-admin";
const app = admin.app();
export const onStart =
functions.database.instance('my-db-1')
.ref('path')
.onCreate(async (snapshot, context) => {
return await onCreate('my-db-1',snapshot,context);
});
export const onStartDb01 = functions.database.instance('my-db-2')
.ref('path')
.onCreate(async (snapshot, context) => {
return await onCreate('my-db-2', snapshot, context);
});
async function onCreate(dbInstance: string, snapshot:
functions.database.DataSnapshot, context: functions.EventContext):
Promise<any> {
const defaultDb = app.database(defaultDbUrl);
const actvDb = app.database(actvDbUrl);
await defaultDb.ref('path')
.once("value")
.then(snap => {
const val = snap.val();
---do something and write back---
});
await actvDb.ref('path')
.once("value")
.then(snap => {
const val = snap.val();
---do something and write back---
});
return true;
}
But when a db event is fired, it logs the error as below
Error: FIREBASE FATAL ERROR: Database initialized multiple times. Please make sure the format of the database URL matches with each database() call.
You'll need to initialize a separate app() for each database instance.
Based on Doug's answer here that should be something like this:
const app1 = admin.initializeApp(functions.config().firebase)
const app2 = admin.initializeApp(functions.config().firebase)
And then:
const defaultDb = app1.database(defaultDbUrl);
const actvDb = app2.database(actvDbUrl);
Currently, the logic for deleting user data is the following:
import * as admin from 'firebase-admin';
import * as functions from 'firebase-functions';
const firestore_tools = require('firebase-tools');
admin.initializeApp();
const Auth = admin.auth();
const UsersCollection = admin.firestore().collection(`users`);
exports.deleteUserDocuments = functions.auth.user().onDelete((user) => {
const userID = user.uid;
UsersCollection.doc(userID)
.delete({})
.catch(error => {
return error
});
});
But since the user document record contains nested collections that contain other documents and collections they are still preserved due to the fact:
When you delete a document, Cloud Firestore does not automatically delete the documents within its sub-collections
I've researched a bit and found a documentation on how to create a callable function:
https://firebase.google.com/docs/firestore/solutions/delete-collections
But I wonder is it possible to have this logic instead executed from the auth.user.onDelete trigger?
Update with the Solution
const firestore_tools = require('firebase-tools');
exports.deleteUserDocuments = functions.auth.user().onDelete((user) => {
const userID = user.uid;
const project = process.env.GCLOUD_PROJECT;
const token = functions.config().ci_token;
const path = `/users/${userID}`;
console.log(`User ${userID} has requested to delete path ${path}`);
return firestore_tools.firestore
.delete(path, {
project,
token,
recursive: true,
yes: true,
})
.then(() => {
console.log(`User data with ${userID} was deleted`);
})
});
You can run whatever code you want in whatever trigger you want. The type of the trigger doesn't have any bearing on the type of code you can run.
I am using "firestore" database for my "dialogflow" chat bot which I already created for an online grocery store. The problem is: I want my chatbot to initially ask questions from users to find the proper item title in my database and then return to user by asking 3-4 support relevant questions about that item. the questions must be the item attributes (Brand, color, size...) and will vary from one item to another. so the chatbot will stream down the user to find the best item.
can you please help me to find the answer? I already created the codes but they don't work and I do not know what is wrong with that. If you already created this and have the index.js file, I appreciate to propose me here.
index.js:
'use strict';
const functions = require('firebase-functions');
// Import admin SDK
const admin = require('firebase-admin');
const {
WebhookClient
} = require('dialogflow-fulfillment');
process.env.DEBUG = 'dialogflow:*'; // enables lib debugging statements
admin.initializeApp(functions.config().firebase);
// here we get the database in a variable
const db = admin.firestore();
const data = {...};
// Add a new document in collection "dialogflow" with document ID 'agent'
const dialogflowAgentRef = db.collection('dialogflow').doc('agent').set(data);
exports.dialogflowFirebaseFulfillment = functions.https.onRequest((request, response) => {
const agent = new WebhookClient({
request,
response
});
function writeToDb(agent) {
// Get parameter from Dialogflow with the string to add to the database doc
const databaseEntry = agent.parameters.databaseEntry;
// Get the database collection 'dialogflow' and document 'agent' and store
// the document {entry: "<value of database entry>"} in the 'agent' document
const dialogflowAgentRef = db.collection('dialogflow').doc('agent').where('title', '==', title);
return db.runTransaction(t => {
t.set(dialogflowAgentRef, {
entry: databaseEntry
});
return Promise.resolve('Write complete');
}).then(doc => {
agent.add(`Wrote "${databaseEntry}" to the Firestore database.`);
}).catch(err => {
console.log(`Error writing to Firestore: ${err}`);
agent.add(`Failed to write "${databaseEntry}" to the Firestore database.`);
});
}
function readFromDb(agent) {
// Get the database collection 'dialogflow' and document 'agent'
const dialogflowAgentDoc = db.collection('dialogflow/agent/rss/channel/item'); // .doc('agent')
// Get the value of 'entry' in the document and send it to the user
return dialogflowAgentDoc.get()
.then(doc => {
if (!doc.exists) {
agent.add('No data found in the database!');
} else {
agent.add(doc.data().entry);
}
return Promise.resolve('Read complete');
}).catch(() => {
agent.add('Error reading entry from the Firestore database.');
agent.add('Please add a entry to the database first by saying, "Write <your phrase> to the database"');
});
}
// Map from Dialogflow intent names to functions to be run when the intent is matched
let intentMap = new Map();
intentMap.set('ReadFromFirestore', readFromDb);
intentMap.set('WriteToFirestore', writeToDb);
agent.handleRequest(intentMap);
});
There are a number of issues with your code as you've shown it that could cause problems reading and writing with the Firestore database.
It looks like you're trying to find an existing collection to write to with the line
const dialogflowAgentRef = db.collection('dialogflow').doc('agent').where('title', '==', title);
but title isn't defined anywhere, which I suspect causes an error. Furthermore, doc() returns a DocumentReference, but there is no where() method in a DocumentReference.
Remember that you need to structure Firestore using alternating collections and documents. So your "firebase" collection can contain a document named "agent", and that document may have subcollections.
When you're trying to read with
const dialogflowAgentDoc = db.collection('dialogflow/agent/rss/channel/item');
You're getting a collection, but then trying to treat it as a document. The comment suggests that you're trying to read a specific doc from this collection (which makes sense), but you're loading that document by a hard-coded string "agent", rather than trying to get the agent from the parameters passed to you from Dialogflow.
Finally - the paths in the read and write sections don't match. Using hard-coded paths are fine when testing, but make sure you're using matching paths and that they reflect the collection/doc/collection/doc/... path requirement.
So in both cases, you might have a reference that looks something like
const docTitle = agent.parameters.title;
const docRef = db.collection('dialogflow').doc(title);
Which, if you have defined a "title" parameter in your Intents in Dialogflow, will use this to reference the doc, which you can then read or write.
thanks for the answer I already changed my database to real time firebase instead of firestore. still having problem with support relevant questions. I want to go to my real time database to find the item by search using "oederByChild" and "equalTo" methods as I found these in people questions and answer in this website. still cannot find and item title through my database child. here is the codes are written:
'use strict';
const functions = require('firebase-functions');
const admin = require('firebase-admin');
const {
WebhookClient
} = require('dialogflow-fulfillment');
process.env.DEBUG = 'dialogflow:*'; // enables lib debugging statements
admin.initializeApp(functions.config().firebase);
const db = admin.database();
// const ref = db.ref('server/saving-data/fireblog');
exports.dialogflowFirebaseFulfillment = functions.https.onRequest((request, response) => {
const agent = new WebhookClient({
request,
response
});
console.log('Dialogflow Request headers: ' + JSON.stringify(request.headers));
console.log('Dialogflow Request body: ' + JSON.stringify(request.body));
// Get the database collection 'dialogflow' and document 'agent' and store
// the document {entry: "<value of database entry>"} in the 'agent' document
function writeToDb(agent) {
const databaseEntry = agent.parameters.databaseEntry;
const acc = db.ref('rss/channel/item/4/title'); //**This worked! */
acc.set({
entry: databaseEntry
});
return Promise.resolve('write complete')
.then(_acc => {
agent.add(`Wrote ${databaseEntry} to the realtime database.`);
return false;
}).catch(err => {
console.log(`Error writing to Firestore: ${err}`);
agent.add(`Failed to write "${databaseEntry}" to the Firestore database.`);
});
}
// and this is when we want to write to in the same child, keeping the old values:
//const acc = db.ref('/rss/channel/item/5/color'); //**This worked! */
//const result = acc.child(databaseEntry).set({entry: databaseEntry});
//agent.add(`Wrote ${databaseEntry} to the realtime database.`);
//console.log(result.key);
//});
// to read data
function readFromDb(agent) {
const any = agent.parameters.any;
agent.add(`Thank you...`);
var rootRef = db.ref();
var childref = rootRef.child("rss/channel/item");
return childref.orderByChild("title").equalTo("Icebreaker").once("value").then(function(snapshot){ //has been taken from the bus example: https://stackoverflow.com/questions/51917390/dialogflow-how-do-i-pass-a-parameter-through-in-a-firebase-query
var colored = snapshot.child("color/__text").val();
var sized = snapshot.child("size/__text").val();
agent.add(`Your search result for ` + any + ` Throughout the database is ` + colored +
` Color and ` + sized + ` Size`);
return Promise.resolve('Read complete');
}).catch(() => {
agent.add('Error reading entry from the Firestore database.');
agent.add('Please add a entry to the database first by saying, "Write <your phrase> to the database"');
});
}
// Map from Dialogflow intent names to functions to be run when the intent is matched
let intentMap = new Map();
intentMap.set('IWannaBuy', readFromDb);
intentMap.set('WriteToFirebase', writeToDb);
agent.handleRequest(intentMap);
});
enter code here
[this is how my database is][1]
[1]: https://i.stack.imgur.com/QdFy5.png