Firebase cloud function onCreate not running? - javascript

I've been following a tutorial (https://www.youtube.com/watch?v=9kRgVxULbag&t=1108s) and I'm trying to get .onCreate to work, but nothing's happening.
The code I'm trying to replicate is at around 19:30 in the video, and here's what I've got:
exports.createinvite = functions.firestore
.document('referrals/{referralid}')
.onCreate(event => {
console.log('asfasdfasdf')
const docid = event.params.referralid;
const code = event.data.data().thing;
const referralref = admin.filestore().collection('referrals').doc(docid)
return referralref.update({message: `asfasfasdfa`})
});
Any help is appreciated :)

You are following a very old tutorial, and I suggest you stop following it and learn from something newer, such as the official Firebase videos on YouTube. The APIs have changed.
Please also follow the documentation for Firestore triggers to learn what an onCreate function looks like today. They take two parameters, a snapshot and a context:
exports.createinvite = functions.firestore
.document('referrals/{referralid}')
.onCreate((snapshot, context) => { ... })
The wildcards from the pattern are available in context.params. You will use context.params.referralid to get the value of the wildcard.

If you look at the documentation for Firestore event triggers, you'll see that onCreate is called with two parameters: snapshot and context. The params property exists on the context/second parameter, and not on the first.
So:
exports.createinvite = functions.firestore
.document('referrals/{referralid}')
.onCreate((snapshot, context) => {
console.log('asfasdfasdf')
const docid = context.params.referralid;
const code = snapshot.data().thing;
...
I highly recommend checking out the documentation if something from a tutorial doesn't work, as the product may have been updated since the tutorial was created.

Related

Firebase: Trouble getting field value

Given the following data struct in firebase, I wish to retrieve the field in just standard JS. I have tried many methods of getting it, but for some reason, I cannot. I have tried .get(), forEach(), I have tried getting a snapshop, but it won't work.
At the start of my JS file I do:
const auth = firebase.auth();
const db = firebase.firestore();
let totalGroups;
db.collection('totalGroups').doc('totalGroups').get().then(function(querySnapshot) {
querySnapshot.docs.forEach(function(doc) {
if (doc.data().totalGroups != null) {
totalGroups = doc.data().totalGroups console.log("here is total groups" + totalGroups)
//Total Groups is undefined out here but defined in fuction
}
})
})
and normally I am able to get .get() just fine. I am looking for the most simple method of getting this value. thanks.
First, you are using get() on a DocumentReference which returns a DocumentSnapshot containing data of that single document only and has no docs property on it. Try refactoring the code as shown below:
db.collection('totalGroups').doc('totalGroups').get().then(function(snapshot) {
const docData = snapshot.data();
console.log(docData)
})
Also do note that if you were using get() on a CollectionReference, then it would have returned a QuerySnapshot where the existing code works fine.

How can I use the Google Translate API inside a redux async thunk?

I have been trying to integrate the google translate API with my redux app, but I can't seem to get it to work. I have downloaded my private keys and saved them to a local file path. When I run the example code it work perfectly. The problem arises when I try to call the translate function inside my async redux thunk, as follows:
const projectId = '{my google cloud project id goes here}'
const keyFilename = '{the full path to my private key goes here}'
const translate = new Translate({projectId, keyFilename});
export const addPairs = createAsyncThunk(
'pairs/addPairs',
async () => {
let [translations] = await translate.translate('hello world', 'en');
return translations
}
)
Whenever I call this function using dispatch, it always returns this error:
fs.createReadStream is not a function
I can't seem to figure out why this is the case and I have already tried to search up for any other solutions but it doesn't seem that anyone has had a similar use case before... Any help would be much appreciated!
I just realized that I couldn't read the key from my local filesystem on the browser (as the API was obviously intended for server-side code) so the best way to go would be to set up a local server to serve the API and then access that from the client. Oops.

Update another location onUpdate with firebase cloud functions [duplicate]

This question already has answers here:
Firebase DB - How to update particular value of child in Firebase Database
(3 answers)
Closed 4 years ago.
I am trying to keep some data consistent with firebase cloud functions. When data changes in the main list, I want all the data to change in the user's favourite list.
Currently, I am able to call the function and get a log of the correct data which is changing, but my query doesn't work. I am getting the following error:
TypeError: ref.update is not a function
at exports.itemUpdate.functions.database.ref.onUpdate
Here is my code:
const functions = require('firebase-functions');
const admin = require('firebase-admin');
admin.initializeApp(functions.config().firebase);
exports.itemUpdate = functions.database
.ref('/items/{itemId}')
.onUpdate((change, context) => {
const before = change.before.val(); // DataSnapshot after the change
const after = change.after.val(); // DataSnapshot after the change
console.log(after);
if (before.effects === after.effects) {
console.log('effects didnt change')
return null;
}
const ref = admin.database().ref('users')
.orderByChild('likedItems')
.equalTo(before.title);
console.log(ref);
return ref.update(after);
});
I'm not to sure where I am going wrong, I appreciate all the help and guidance to resolve this!
Cheers.
equalTo() returns a Query object. You're then trying to call update() on that object. Note that in the linked API docs, Query doesn't have an update() method. You can't simply "update" a Query that hasn't been performed. You're going to have to actually perform the query using once(), iterate the results form the snapshot in the returned promise, and perform further updates using the data you find.

Firestore - get specific fields from document

What I need:
I want to save articles or notes in Firestore with their respective fields:
Title
Content (texts or paragraphs)
Creation date
Owners (to share that article with other
people and who can edit them like: https://firebase.google.com/docs/firestore/solutions/role-based-access)
But when I show the list of articles I don't need the "content" field (to save bandwidth). I've read that (maybe I'm wrong), it is not possible to make a query to get only specific fields from a document with Firestore.
If it were normal SQL to obtain specific columns from articles (without its content) It would be something like:
SELECT title, creation_date, ...
FROM table_name;
So I've opted to separate the content for two root-level collections (for flexibility and scalability)
My current structure:
Articles collection:
- `articles` [collection]
- `ARTICLE_ID` [document]
- `creatorId` [field]
- `title` [field]
- `date` [field]
- `owners` [obj field]
- {user1_id}: true
- {user2_id}: true
...
Contents collection:
- `contents` [collection]
- `{ARTICLE_ID}` [document]
- `content` [field]
To get articles list in realtime:
firebase.firestore().collection('articles')
.where(`owners.${user.uid}`, '==', true)
.onSnapshot(querySnapshot => {
const articles = []
querySnapshot.forEach((doc) => {
articles.push({
id: doc.id,
...doc.data()
})
})
// do something with articles array
})
To show in another view and get the entire article with its content:
const db = firebase.firestore()
const articleRef = db.collection('articles').doc(articleId)
const contentRef = db.collection('contents').doc(articleId) // same Id as article
articleRef.get().then(articleDoc => {
if (articleDoc.exists) {
contentRef.get().then(contentDoc => {
if (contentDoc.exists) {
const article = {
...articleDoc.data(),
...contentDoc.data()
}
// full article obj
}
})
}
})
My questions
Do you think it's better to do two queries (getArticle and getContent) at the same time and wait with Promise.all() instead of nesting the querys like I do?
Is there a better way to get the article and its content with one query or more efficiently? Some tips or ideas?
Thank you very much in advance!
According to the Firestore Query.select documentation you should be able to select the fields you want.
let collectionRef = firestore.collection('col');
let documentRef = collectionRef.doc('doc');
return documentRef.set({x:10, y:5}).then(() => {
return collectionRef.where('x', '>', 5).select('y').get();
}).then((res) => {
console.log(`y is ${res.docs[0].get('y')}.`);
});
Neither approach is pertinently better than the other. But there are a few key differences.
When you nest the reads, the second read only starts after the first read has completed. When you use Promise.all() both reads start at the same time, so can (partially) run in parallel.
On the other hand: when you use Promise.all() your completion handler (the code you run in then()) won't execute until both documents have loaded. If you nest the calls, you can update the UI after just the first document has loaded.
In the end, the differences are likely to be small. But since they may be significant to your use-case, measure the results and see what works best for you.
In order to output a single field from a Firestore document (version 9) - for example the 'title' in the articles collection you can use the following code snippet:
const q = query(collection(db, 'articles'))
let results = [];
await getDocs(q);
results = getLocation.docs.map((doc) => doc.data()['title']);
results.sort()
The results array will contain only the title field, sorted alphabetically
(Note you have to reference the Firestore db and import 'getDocs', 'query' and 'collection' modules from Firestore)
Firebase Hosting would be your best bet for static content such as articles. If you look at AMP-HTML for example, they strongly make the case for ultra-fast page loads and highlight benefits of edge caching. Firebase hosting is advertised to also support global edge caching.
Firestore and Firebase Realtime Database are database engines. These are not the proper tool for serving up articles.

Cloud Functions for Firebase to index Firebase Database Objects in Algolia

I went through docs, github repositories but nothing worked for me yet.
My datastructure:
App {
posts : {
<post_keys> : {
auth_name : "name",
text : "some text" //and many other fields
}
}
}
1) Github repository : If I use this, I only get one field from one function, if I need all the fields, I would need to write separate functions for each, which is a bad approach.
2) Algolia Official Docs for Node.js : This cannot be deployed as a cloud function, but it does what I intend to do.
How can I write a function that can be deployed on Firebase and gets the whole object indexed with its key in Algolia?
Okay so I went ahead to create a Firebase Cloud function in order to index all objects in the Algolia index. This is the solution:
What you were doing is something like this:
exports.indexentry = functions.database.ref('/blog-posts/{blogid}/text').onWrite(event => {
What you should do is the following:
exports.indexentry = functions.database.ref('/blog-posts/{blogid}').onWrite(event => {
const index = client.initIndex(ALGOLIA_POSTS_INDEX_NAME);
var firebaseObject = event.data.val();
firebaseObject.objectID = event.params.blogid;
return index.saveObject(firebaseObject).then(
() => event.data.adminRef.parent.child('last_index_timestamp').set(
Date.parse(event.timestamp)));
});
The difference is in the first line: In the first case, you only listen to text changes, hence you only get the data containing the text change.
In the second case, you get the whole object since you listen to changes in all of the blog object (notice how /text was removed).
I tested it and it works for me: whole object including author was indexed in Algolia.

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