How can i update the value of a document on changing the value of another document.
I have raw-material document and finished-product document.
What i want to do is on changing the price of raw-material i want to update the price of finished-material
How can i do so ???
My code is like this so far
export const rawMaterialPriceChange = functions.database.ref('/raw-materials/{key}').onUpdate((snapshot)=>{
console.log('My key',snapshot.after.key);
var priceDiff = parseFloat(snapshot.after.val().price)-parseFloat(snapshot.before.val().price);
<HERE I WANT TO REFER ANOTHER DOCUMENT WITH SAME KEY AND UPDATE ITS VALUE
return true;
});
My firebase structure is like this:
Can anyone please help me ? Thank you
Found the solution from the following threads
Firebase HTTP Cloud Functions - Read database once
How to run query from inside of Cloud function?
Related
I have read a few posts but I am confused. This is the first time I've used firebase realtime database (I've used firestore without much problems upto now).
My data looks like the following:
It gets automatically updated. I have to make a flutter app now which can read this data and write to this individual document as well. I just can get past a simple read. Could use some help please. My simple code is attached to a button. I want to then tap into the data and make a listview.
onPressed: () async {
final fb = FirebaseDatabase.instance.reference();
fb.child('turk****fault-rtdb/1buFA3****am6w32mDGon****kCeLs/Form Responses 1/').once()
.then((DataSnapshot data) {
print("Value: ${data.value}"); // prints null
print("Key: ${data.key}"); // prints Form Response 1
}).catchError((onError){
if (kDebugMode) print (onError);
});
How can I tap into each 'record' and get details out of it?
This looks off:
fb.child('turk****fault-rtdb/1buFA3****am6w32mDGon****kCeLs/Form Responses 1/').once()
You can't pass the database URL itself into the child() call.
Try this instead:
final fb = FirebaseDatabase("your database URL").reference()
fb.child('Form Responses 1').once()...
Also see: Why is the Firebase Realtime Database's data appearing as null in the console?
Background
I'm trying to upload images to firebase storage manually (using the upload file button in the web page), however I have no clue how to later link them to a firestore document. What I have come up with (I'm unsure if it works) is copying the url for the image in the storage bucket and adding it to a string type field in the document called profilePicture. The reason I'm unable to get this to work is that I'm really new to React Native and I don't know how to properly require the images other than typing in the specific local route. Mind you also, the way I'm requiring user data such as a profile name is after logging in with email/password auth I pass the data as a param to react navigation and require it as extraData.
What I have tried
Once I've copied the image url and pasted it in the firestore document I'm doing this:
const profilePicture = props.extraData.profilePicture;
<Image source={require({profilePicture})}/>
I have also tried using backticks but that isn't working either. The error message I'm getting is:
TransformError src\screens\Profile\ProfileScreen.js: src\screens\Profile\ProfileScreen.js:Invalid call at line 27: require({
profilePicture: profilePicture
})
Note: this is an expo managed project.
Question
Is the problem in the code or in the way I'm linking both images? Maybe both? Should I require the document rather than relying on the data passed previously?
Thanks a lot in advance!
Edit 1:
I'm trying to get all info from the current user signed in, after a little research I've come to know about requiring images in this manner:
const ref = firebase.storage().ref('path/to/image.jpg');
const url = await ref.getDownloadURL();
and then I'd require the image as in <Image source={{uri: url}}/>
I get that this could be useful for something static, but I don't get how to update the ref for every single different user.
Edit 2:
Tried using the method mentioned in Edit 1, just to see what would happen, however It doesn't seem to work, the image just does not show up.
Maybe because my component is a function component rather than a class component (?
I understand that your goal is to generate, for each image that is uploaded to Cloud Storage, a Firestore document which contains a download URL.
If this is correct, one way is to use a Cloud Function that is triggered each time a new file is added to Cloud Storage. The following Cloud Function code does exactly that. You may adapt it to your exact requirements.
exports.generateFileURL = functions.storage.object().onFinalize(async object => {
try {
const bucket = admin.storage().bucket(object.bucket);
const file = bucket.file(object.name);
// You can check that the file is an image
const signedURLconfig = { action: 'read', expires: '08-12-2025' }; // Adapt as follows
const signedURLArray = await file.getSignedUrl(signedURLconfig);
const url = signedURLArray[0];
await admin.firestore().collection('profilePictures').add({ fileName: object.name, signedURL: url }) // Adapt the fields list as desired
return null;
} catch (error) {
console.log(error);
return null;
}
});
More info on the getSignedUrl() method of the Admin SDK here.
Also note that you could assign the Firestore document ID yourself, instead of having Firestore generating it as shown in the above code (with the add() method). For example, you can add to the image metadata the uid of the user and, in the Cloud Function,get this value and use this value as the Document ID.
Another possibility is to name the profile image with the user's uid.
I'm trying to make an image upload button and link it to Firebase such that each time the button is pressed, the image is sent to Firebase Storage. Here are the relevant snippets of my code:
// Files, and references
File _imageFile;
StorageReference _reference =
FirebaseStorage.instance.ref().child('myimage.jpg');
Future uploadImage() async {
// upload the image to firebase storage
StorageUploadTask uploadTask = _reference.putFile(_imageFile);
StorageTaskSnapshot taskSnapshot = await uploadTask.onComplete;
// update the uploaded state to true after uploading the image to firebase
setState(() {
_uploaded = true;
});
}
// if no image file exists, then a blank container shows - else, it will upload
//the image upon press
_imageFile == null
? Container()
: RaisedButton(
color: Colors.orange[800],
child: Text("Upload to Firebase Storage"),
onPressed: () {uploadImage();}),
However, each time I press this button, the image overwrites the pre-existing image with the same name, and I was wondering if there's a way to make it so that each time I press the button, the name of the image changes, and as a result the original image isn't overridden. I'd greatly appreciate any help I could get as I'm very new to Flutter and Firebase.
Thank you!
I think you're looking for a UUID generator.
Fortunately there is a packege for that : uuid
String fileID = Uuid().v4(); // Generate uuid and store it.
Now you can use postID as name for your file.
NOTE When you upload your file you may want to generate new uuid to avoid using the old one :)
One more thing: PLEASE dont use DateTime.now() think about if two users uploaded an image at the same time !!
Basically, when you call:
FirebaseStorage.instance.ref().child('myimage.jpg');
You're uploading the file with the same name everytime:
myimage.jpg
In order to fix your problem, you just need to generate a random key for the image. There are a couple ways you could do this:
Ideally, you would use the Uuid package which is specifically for use-cases like this.
If you are set up with Firestore (the database that Firebase offers) then you can push the name of the image to the database, and have it return the DocumentID which Firestore will create a random ID for you that isn't used.
You could also use the current Date/Time (which would be considered a bad practice for major applications, but for a personal project it will serve you just fine):
DateTime.now().toString()
or
DateTime.now().toIso8601String();
Or of course, you can always write your own hashing function, based on the name of the file that you are uploading, which you would get by doing:
_imageFile.toString();
Then once you get the random name of the file, you should upload it like this:
FirebaseStorage.instance.ref().child(myImageName).putFile(_imageFile);
This maybe a late answer but hope it helps someone in future,had the same challange my solution:
I used DateTime.now().toString(),but before that i got the current logged in user UID from firebase,
then added it to every outgoing save to storage request like this
DateTime.now().toString() + (_auth.currentUser!.uid),
This made every file unique and solved the overwriting issue for me.
ARK*
Simply Add a Document Reference
DocumentReference myDoc = FirebaseFirestore.instance
.collection('COLLECTION')
.doc();
myDoc having your new Document Id.
myDoc.set({'data':'test'});
I configured different firebase functions by following this
. Now in this, there is firebase full-text search. I tried to follow it but it seems to be incomplete. I have searched and somehow got success in deploying. But it is still not creating index in Algolia. Can someone tell me the steps to correctly perform this?
I created the blog-posts and search nodes in my firebase project but problem is still there.
CODE:
'use strict';
const functions = require('firebase-functions');
const admin = require('firebase-admin');
admin.initializeApp(functions.config().firebase);
// Authenticate to Algolia Database.
// TODO: Make sure you configure the `algolia.app_id` and `algolia.api_key` Google Cloud environment variables.
const algoliasearch = require('algoliasearch');
const client = algoliasearch(functions.config().algolia.app_id, functions.config().algolia.api_key);
// Name fo the algolia index for Blog posts content.
const ALGOLIA_POSTS_INDEX_NAME = 'blogposts';
// Updates the search index when new blog entries are created or updated.
exports.indexentry = functions.database.ref('/blog-posts/{blogid}/text').onWrite(event => {
const index = client.initIndex(ALGOLIA_POSTS_INDEX_NAME);
const firebaseObject = {
text: event.data.val(),
objectID: event.params.blogid
};
return index.saveObject(firebaseObject).then(
() => event.data.adminRef.parent.child('last_index_timestamp').set(
Date.parse(event.timestamp)));
});
// Starts a search query whenever a query is requested (by adding one to the `/search/queries`
// element. Search results are then written under `/search/results`.
exports.searchentry = functions.database.ref('/search/queries/{queryid}').onWrite(event => {
const index = client.initIndex(ALGOLIA_POSTS_INDEX_NAME);
const query = event.data.val().query;
const key = event.data.key;
return index.search(query).then(content => {
const updates = {
'/search/last_query_timestamp': Date.parse(event.timestamp)
};
updates[`/search/results/${key}`] = content;
return admin.database().ref().update(updates);
});
});
SEE IMAGE OF FIREBASE NODE
Open Image
Your help will be appreciated. Thanks
So I used the sample code provided here and placed it into a Firebase cloud function. Writing to '/blog-posts/{blogid}/text' inside the database should index whatever value is under text to Algolia.
There are a few things that might be going wrong here:
Check that your function is correctly placed into Firebase. You can do this from the console by clicking functions on the left side. You should see two functions named indexentry and searchentry. If you do not see those functions then you haven't correctly pushed your code to the Firebase cloud.
If you code is in Firebase cloud then I recommend adding console.log("write on blog-posts fired"); to your searchentry function. Then write some more data to your database under '/blog-posts/{blogid}/text'. You can check the function log in the Firebase console. I have noticed a slight delay in log records displaying some times, so be patient if you don't see it right away. I'd write a few pieces of data to '/blog-posts/{blogid}/text' then after a couple minutes I'd check the log. If the log has "write on blog-posts fired" in it then you know the function is being activated when you write to the database.
If all the above is operating correctly and you still don't have any data in Algolia then make sure you set your API keys. You can do this using the code firebase functions:config:set algolia.app_id="myAlgoliaAppId" algolia.api_key="myAlgoliaApiKey". You run this command in a terminal window inside the directory where you have your Firebase cloud functions. You can get you API keys by signing into your account. Remember not to share your API key with anyone.
I am using Angularfire2 and I'm tesing to build a chat app that pushes messages in the database. I want to get the time when the data is pushed. Your help is really appreciated. Thanks a lot!
Firebase uses a constant value which is replaced with a numeric timestamp when it is written to the database. This removes the need to track and synchronize the time across clients.
firebase.database.ServerValue.TIMESTAMP
You can then read the value of the reference that was just written to see the exact time.
var sessionsRef = firebase.database().ref('sessions');
var mySessionRef = sessionsRef.push();
mySessionRef.update({ startedAt: firebase.database.ServerValue.TIMESTAMP });
mySessionRef.once('value').then(function(dataSnapshot) {
var time = dataSnapshot.child('startedAt'); // the time when the data was written
});
firebase.database['ServerValue']['TIMESTAMP']