Firestore check if user exists
WebSep 10, 2024 · 7 Answers Sorted by: 38 Async / Await Function To Check If Document Exists In Firestore (with Flutter / Dart) A simple async / await function you can call to check if a document exists. Returns true or false. WebMay 6, 2024 · Use the exists method on the snapshot: final snapShot = await FirebaseFirestore.instance.collection ('posts').doc (varuId).get (); if (snapShot.exists) { // Document already exists } else { // Document doesn't exist } Share Improve this answer Follow edited Apr 15, 2024 at 15:58 answered Dec 17, 2024 at 21:00 MobileMon 8,261 5 …
Firestore check if user exists
Did you know?
WebFeb 19, 2024 · 1 Answer. The resource variable refers to the requested document, and resource.data is a map of all of the fields and values stored in the document. However, request.resource.data contains data that is being added in document in update/write operations. You should be using resource.data because you want to check existing data. WebFeb 26, 2024 · My goal is to be able to write a security rule where only Users in the 'UsersJoined' can read/write to the corresponding Topic. This is what I have right now as my rules: service cloud.firestore { match /databases/ {database}/documents { match /Topics/ {topicUID} { allow read, create, update, delete: if exists (/databases/$ …
WebSep 10, 2024 · 3 Answers. Sorted by: 3. Here is a simple function for checking if the username is already exists on client side. var _instance = Firestore.instance; Future userExists (String username) async => … WebNov 16, 2024 · 5 Answers. If you want to check a particular document for existence based on its document id, please use the following lines of code: FirebaseFirestore rootRef = FirebaseFirestore.getInstance (); DocumentReference docIdRef = rootRef.collection ("yourCollection").document (docId); docIdRef.get ().addOnCompleteListener (new …
WebOct 5, 2024 · The users should be in a collection, and each user is a document. This is how I check if the user exists in the login activity: FirebaseFirestore db = FirebaseFirestore.getInstance (); final … WebApr 9, 2024 · I want to update data in Firestore being triggered by cloud Functions. Using Admin SDK, I checked reference path like this below. Not working well. export const userProfileUpdate = functions .firestore.document ("/users/ {userId}") .onUpdate (async (change, context) => { const userId = context.params.userId const afterData = …
WebMar 27, 2024 · I have an Android Studio project with 2 user collections: trainers and trainees. I want to make a method that receives the user's string email as input (the user's email is the document ID in both collections and a user can be either in the trainees collection or in the trainers collection not in both) and the method returns a boolean …
WebFeb 2, 2024 · if (ds!=null) means that username is present, you can use else block which tells that ds is null which means there is no username present like of userNameToCheck. Above method is direct and efficient since it query … traditional messagesWebApr 11, 2024 · One of the most common security rule patterns is controlling access based on the user's authentication state. For example, your app may want to allow only signed-in users to write data: service cloud.firestore {. match /databases/ {database}/documents {. // Allow the user to access documents in the "cities" collection. the sandbox coinmarketcapWebCheck if Firestore user exists when rules forbid anybody but the user to read 2 I have the following rules set up for the users collection match /users/ {userId} { allow read, write, update: if request.auth != null && request.auth.uid == userId } And I would like to check if a user exists but the above rules won't let me. the sandbox coin nedirWebMay 18, 2024 · firebase.auth ().onAuthStateChanged (async (user)=> { if (user == null) { //the user is not signed in, navigate to login screen }else { //the user is signed in, try to check if he exists in the database or register him //let say you are using firestore roo let user_ = await firebase.app ().auth ().currentUser firebase.firestore ().collection … traditional mermaid tattoo flashWebApr 9, 2024 · It looks like your role is a custom claim, in which case it exists in the token property in your rules. So: return request.auth.uid == userId && request.auth.token.role == 'user' // 👆 Also see: Firestore security rules, how to check if claim exists and is a string; The documentation on request.auth traditional mediterranean instant potWebNov 23, 2024 · I'm trying to add a check in my app via a StreamBuilder to show users different screens based upon if a user's document exists in Firestore. My code technically works but on hot reload, it shows my 'AddUser' screen for a couple of seconds before moving over to my 'UserHomeScreen'. the sandbox coin prognoseWebSep 7, 2024 · user_doc_ref = db.collection(u'UsersInfo').where(u'UserID', u'==', user_ID).stream() for x in user_doc_ref: user_doc = x which is assuming there's only one user document satisfying the query. But this works no matter if the document actually exists or not, and always returns the generator user_doc_ref. traditional metal braces oak ridge