Recent questions tagged FireBase

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firebase - Check if Field Already exists in Flutter Firestore

I have a collection called company. All the companies are going to be stored like in my screenshot. When I add ... : "Company already exists!". See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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745 views

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firebase - Get all from a Firestore collection in Flutter

I set up Firestore in my project. I created new collection named categories. In this collection I created three ... firebase_firestore: 0.0.1+1 See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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778 views

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firebase - Failed to retrieve settings from https://settings.crashlytics.com/spi/v2/platforms/android/apps/

I am trying out the new Firebase/Crashlytics setup and seem to run into a weird issue. I have one ... /android/apps/package name/settings See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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724 views

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firebase - Query a single document from Firestore in Flutter (cloud_firestore Plugin)

I want to retrieve data of only a single document via its ID. My approach with example data of: TESTID1 { 'name': ... ()); ); is not executed. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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595 views

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firebase - Transcation updateFunction parameter is null

I can't get transaction to work and need some help I created the following db structure using the FB app dashboard: ... is always 'null' why ?? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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866 views

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firebase - My .indexOn rule added to Security & Rules isn't taken into account

I'm trying to set up custom indexes on my firebase data for sorting on certain fields. Here is my data: GET ... any help. Best, State variable See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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680 views

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firebase - Pagination in firestore api

I am trying to paginate documents with firestore beta. I am following the official docs I see there is a ... a pagination system? thank you See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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760 views

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firebase - Firestore compound query with <= & >=

I need to query a firestore collection for entries where a start time (which is a number) is >= slot.start and ... to load a lot of data then. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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500 views

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firebase - How to update a FirebaseRecyclerAdapter's query

If I have a Query a, and I'm setting it to a FirebaseRecyclerAdapter. Then, I want to constantly create a new ... lazy to even work on this? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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firebase - The method '[]' can't be unconditionally invoked because the receiver can be 'null'

I'm new to Flutter. I am trying to develop an application. I want to show the staff list in the Firebase database. However, ... , ), ), ); } } ` See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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645 views

1 answer

firebase - Data in transaction is null

I have a problem with transactions. The data in the transaction is always null and the update handler is called only singe ... alerts: 3, ... } See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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787 views

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firebase - Push notifications in Apple Safari with FCM

We implemented push notifications using FCM in chrome and firefox and it worked fine, but Safari doesn't support ... of issues? any suggestions? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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460 views

1 answer

firebase - Using a listener after an android application is closed

I've just been reading about adding a service to my application, and since 7/8 there are now service ... I'd implement this? Thanks See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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654 views

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firebase - Is Firestore charging us when offline more than 30 minutes?

I read this answer, where Doug Stevenson (Firebase engineer) said: Cached document reads are not charged. But ... situation. Thanks in advance! See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.1k views

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firebase - How to query documents containing array of objects in Firestore collection using whereArrayContains() filter on Android?

I have a collection in firestore where each document contains an array of contacts and I want to query those ... contain the value parameter. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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723 views

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firebase - Can we not query collections inside transactions?

Looking at https://firebase.google.com/docs/reference/js/firebase.firestore.Transaction I see four methods: delete, ... in a consistent way? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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623 views

1 answer

firebase - How to check statistics for messages sent to topics via FCM?

Statistics for messages sent via FCM can be checked in Google Play Developer console using the message ID or the ... messages sent to topics ? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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770 views

1 answer

firebase - Android FCM notification grouping

I was trying to implement FCM notification for a chat app and I want to achieve "WhatsApp-like" notification where ... How can I achieve that? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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791 views

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firebase - FCM Push notifications do not work on iOS 11

I use Firebase as a backend. I also use FCM as one of the provided features from Firebase. FCM worked ... debugPrint(remoteMessage.appData) } } See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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807 views

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firebase security - Allow update on single field in firestore

I want to give a user the right to update a document. But ONLY if the user updates one specific field ... corresponds to the right field. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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751 views

1 answer

firebase - How to remove listener for DocumentSnapshot events (Google Cloud FireStore)

I'm new in Google Cloud FireStore. The Document object has a function call onSnapshot to attaches a listener for ... how can I implement it? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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645 views

1 answer

firebase - Firestore Pricing - Does The Amount Of Documents In A Collection Matters?

I have read in the documentation that I'm being charged for the amount of the requests I'm making to read, ... get some explaination about it... See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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677 views

1 answer

firebase - Firestore security rule get() not work

The solution is in the end of the post. Check it out. Решение проблемы в конце поста. Дочитайте. just a simple ... ).data.role == "admin"; See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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780 views

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firebase - setPersistenceEnabled(true) crashes app

I'm creating my first Firebase App. One of its requirements is that it run when the network is not available. ... getPhotoUrl().toString(); } } See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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445 views

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firebase - Build fails with 'Program type already present: android.arch.core.util.Function'

After updating my Firebase and Play Services dependencies as well as the Play Services Plugin my project fails to build. I' ... -core:3.0.2' } See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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660 views

1 answer

firebase - Firestore queries on Flutter

How can I use the .where() in FlutterFire to perform queries for Firestore? Because the docs and example doesn't ... I'm not asking duplicate. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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881 views

1 answer

firebase - FCM getting MismatchSenderId

I have an application that uses Google FCM for sending push notifications. When i send a push notification ... get "MismatchSenderId" anymore. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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740 views

1 answer

firebase - Functions debugging in VS Code

From VS Code integrated terminal I run firebase serve --only functions,hosting then in the debug tab I created ... functions in VS Code? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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