firebase-realtime-database

问题 We have a chat system for which we have a analytics dashboard. currently we are showing the top said sentences. The model looks like below: messages --key1 -text: "who are you" --key2 -text: "hello" --key3 -text: "who are you" there is a database trigger that every time a new message gets inserted store a count like below stat --topPhrases --keyA --phrase: "who are you" --count: 2 --key --phrase: "hello" --count: 1 Our dashboard now queries this data and shows on dashboard as top sentences

问题 This is the first time i'm working with firebase. My goal is to have a bounch of client apps (more and more over time), all of them managed by an admin app (One app to rule them all). The thing is that the client apps have a certain content that needs to be updated from the admin app. My best approach is to create a firebase project, put the admin app there and adding client apps over time. I'have read that is possible to have an unlimited number of apps inside one Firebase project. On

问题 Here is my firebase I would like to delete the last deed within deeds which happens to be deed id: 1. I would like to do this without specifying anything other than deleting the last deed in deeds. Here is what I have tried already, but I receive no function errors because i'm returning query type objects. const deedRef = admin.database().ref('/deeds'); deedRef.limitToLast(1).once("value", (snapshot) => { snapshot.val().remove(); }) And const deedRef = admin.database().ref('/deeds'); deedRef

问题 final String uid; final firestoreInstance = Firestore.instance; void printData() async{ var firebaseUser = await FirebaseAuth.instance.currentUser(); firestoreInstance.collection("users").document(firebaseUser.uid).get().then((value){ print(value.data); }); } So this function prints to console the retrieved data from firebase firestore when I press the button. But I want to put them into a widget and display them in my app. For ex: Text(printData()) - but it's not allowed. How can I do that?

问题 I have carefully looked at other answers to similar questions and as far as I can tell everything is set correctly but still access is denied. Minimum working example: My Firebase Live Database Security Rule for the path 'user/{uid}' is as follows "rules": { "user": { "$uid": { ".read": "auth.uid === $uid", ".write": "auth.uid === $uid && !data.exists() " } } } in the typescript I attempt to read 'user/{uid}' for some user. //Firebase and firebase-fcuntions import const firebase = require(

问题 I am trying to get value of every node and its subnodes in the following heirarchy on firebase database. So, I had built the following object Model as a First Approch : public class FirebaseTripDataHolder { String currentStatus,distanceLengthStr, driverId, durationStr, fareEstimate ; public FirebaseTripDataHolder() { } public FirebaseTripDataHolder(String key, String tripStatus, String distanceSTR, String driverIDStr, String durationStr, String fareEstimate) { currentStatus=tripStatus;

问题 In my angular app, I use AngularFire to access firebase realtime database. I have following method to retrieve entities in a certain database path. private db: AngularFireDatabase; public getAll(): Observable<Item[]> { return this.db.list<Item>('some/db/path').valueChanges(); } If I call above method multiple times, does the data get downloaded multiple times from server, or firebase client uses a local cache second time onward? If data gets downloaded multiple times, is there any way I can

问题 I'm trying to implement an Android ordering system and I'm using Realtime Database. To send notifications I'm using Firebase Functions in JavaScript. Each user is stored in the database along with their id, token to send the notification, among other data. What I'm trying to do is detect when a user receives an order and send them a notification . The problem appears here. In some cases the notification is sent and in others it is not . Viewing the logs of my "sendNotif" function I see that

问题 I'm trying to check if a child already has a value or not, if not then increment a child value and add an array of data inside the child. ex: and expect the code will add second child "2": to do this I use doTransaction to check if there are any values within history/userId value, Date c = Calendar.getInstance().getTime(); SimpleDateFormat df = new SimpleDateFormat("dd-MMM-yyyy", Locale.getDefault()); String formattedDate = df.format(c); PlanHistory planHistory = new PlanHistory(formattedDate

问题 I am trying to read the data from firebase after scanning a barcode. This is how it should appear, but instead of barcode, it should display name and price from the database (https://m.imgur.com/gallery/lEFJZ0Q) Code: class ListTileModel { String barcode; ListTileModel(this.barcode); } the below code is inside the stateful widget List<ListTileModel> _items = []; String barcode = ""; void _add() { _items.add(ListTileModel(barcode)); setState(() {}); } @override void initState(){ super