google-cloud-firestore

问题 I don't know why I got stuck in a problem that the chatList is not sorting by the last message time or by the most recent message. I have tried storing timestamp in the database and orderChildBy timestamp but it still not working. not working means the list get not sort after every message and keep showing the list as the sorted after first message. Look at the image how chats are disordered! This is the way I created chatList in the firebaseDatabase in ChatActiviy on sendMessage: val timeAgo

问题 i want to read data from firestore in a listtile i dont want to use streambuilder i want to access the documents field individually i try this but not working class ProductList extends StatelessWidget { Stream<DocumentSnapshot> snapshot = Firestore.instance.collection("listofprods").document('ac1').snapshots(); @override Widget build(BuildContext context) { return MaterialApp( home: Scaffold( appBar: AppBar(), body: Padding( padding: const EdgeInsets.all(8.0), child: Column( mainAxisAlignment

问题 I'm storing trip history (array-map) on firestore. the app is crash (Flutter app) when trying to store a large array map (array length may be more than 10,000). and also there are more than 30 fields on the same doc. this is my map(list of map). Map<String, dynamic> toMap() => { "latitude": latitude, "longitude": longitude, "accuracy": accuracy, "altitude": altitude, "speed": speed, "speed_accuracy": speedAccuracy, "heading": heading, "time": time, }; Is there any solution to store this kind

问题 I'm storing trip history (array-map) on firestore. the app is crash (Flutter app) when trying to store a large array map (array length may be more than 10,000). and also there are more than 30 fields on the same doc. this is my map(list of map). Map<String, dynamic> toMap() => { "latitude": latitude, "longitude": longitude, "accuracy": accuracy, "altitude": altitude, "speed": speed, "speed_accuracy": speedAccuracy, "heading": heading, "time": time, }; Is there any solution to store this kind

问题 This question already has an answer here : How to create a Collection in Firestore with node.js code (1 answer) Closed 2 years ago . I'm developing an chat app in Swift and when the user creates a chatroom for the first time, it obviously doesn't exist yet in Firebase. Only until the first message gets created does everything build out. When my app first loads, in the viewDidLoad(), I'm setting a reference to the chat at this path (keep in mind it doesn't exist): reference = db.collection(

问题 This question already has an answer here : How to create a Collection in Firestore with node.js code (1 answer) Closed 2 years ago . I'm developing an chat app in Swift and when the user creates a chatroom for the first time, it obviously doesn't exist yet in Firebase. Only until the first message gets created does everything build out. When my app first loads, in the viewDidLoad(), I'm setting a reference to the chat at this path (keep in mind it doesn't exist): reference = db.collection(

问题 I am working on a group chat app with Flutter and the Firestore Plugin. Getting the data from the database and converting the snapshot into a List of Messages works totally fine. But now I want to convert the uid from the database into the username (the uids and their usernames are saved in the db). This is my code: final CollectionReference messagesCollection = Firestore.instance.collection('messages'); final CollectionReference usersCollection = Firestore.instance.collection('users');

问题 I am working on a group chat app with Flutter and the Firestore Plugin. Getting the data from the database and converting the snapshot into a List of Messages works totally fine. But now I want to convert the uid from the database into the username (the uids and their usernames are saved in the db). This is my code: final CollectionReference messagesCollection = Firestore.instance.collection('messages'); final CollectionReference usersCollection = Firestore.instance.collection('users');

问题 I'm facing the same problem as this guy question But his accepted answer didn't helped me. The problem: When an user signs out, and another different user signs in, all data shown on my app is from the previous signed out user due to firebase caching system. I searched about this issue and found a solution that consists in calling this method: FirebaseFirestore.instance.clearPersistence(); But everytime and everywhere I place this line of code, throws an exception saying I cannot call this

问题 I am new to firebase cloud functions and I want to update username field of some documents from posts collection when the users collection changes it username field of a particular document. I use the following code to do that: exports.updateProfileUsername = functions.firestore .document('users/{userId}') .onUpdate((change, context) => { const {userId} = context.params; var newUsername = change.after.data().username; var previousUsername = change.before.data().username; if (newUsername