google-cloud-firestore

问题 "@angular/fire": "5.2.3", "firebase": "7.4.0", Note: members is an array and 0,1,2 is map data structures. service.ts getUserChatGroups(uid: string): Observable<DocumentChangeAction<MessageGroupMemberModel>[]> { return this.afs.collection<MessageGroupMemberModel>(`messageGroups`, ref => ref.where('members', 'array-contains-any', [uid])).snapshotChanges(); } page.ts init(): void { const uid: string = this.authService.getUserUid(); this.chatService.getUserChatGroups(uid).subscribe(res => {

问题 I'm using Firestore to keeping data. I want to load data and save it in Array. @Override protected void onCreate(@Nullable Bundle savedInstanceState) { super.onCreate( savedInstanceState ); setContentView( R.layout.activity_map ); searchText = (AutoCompleteTextView) findViewById( R.id.search ); gpsImage = (ImageView) findViewById( R.id.gps_btn ); info = (ImageView) findViewById( R.id.info_btn ); cafe = (ImageView) findViewById( R.id.cafe_btn ); cafelist_btn = (ImageView)findViewById( R.id

问题 Let's say I have the following scenario: I have multiple events, that multiple users can attend. Also, users can attend multiple events. What's the best way of storing the required information with maintaining data consistency? Here's what I came up with and why I don't really fancy them: collection "events" -> event document -> subcollection "users" -> user document Problem: Each user exists on each event, resulting in multiple documents of each user. I can't just update user information as

问题 I am working on a simple project using Swift 5, SwiftUI and Firebase which cycles through given ids in an array, searching in the Cloud Firestore database for each id, and appending the corresponding name associated with the id to a new array. Here is a picture of my database: For example, I am given an array a few ids, then for each element in the given array, I get the document associated with that id, then print the "firstname" field in that document. However, I want to store each

问题 Firestore offers 50000 documents read operations as part of its free bundle. However, in my application, the client is fetching a collection containing price data. The price data is created over time. Hence, starting from a specific timestamp, the client can read up to 1000 documents. Each document represents one timestamp with the price information. This is means that if the client refreshes his/her web browser 50 times, it will exhaust my quota immediately. And that is just for a single

问题 Firestore offers 50000 documents read operations as part of its free bundle. However, in my application, the client is fetching a collection containing price data. The price data is created over time. Hence, starting from a specific timestamp, the client can read up to 1000 documents. Each document represents one timestamp with the price information. This is means that if the client refreshes his/her web browser 50 times, it will exhaust my quota immediately. And that is just for a single

问题 Note that I know there have been some other questions, but no real answer, on SO, regarding this issue. So, what has been happening since the increment field value was implemented, is that when incrementing floating numbers, most of the time you'll get a dozen decimals instead of the actual number. // incrementing 0, with 0.1, 11 times, returns 1.0999999999999999 Math.round( 1.0999999999999999 * 100 + Number.EPSILON ) / 100 This returns the correct number ... so I wonder, can't this be

问题 Note that I know there have been some other questions, but no real answer, on SO, regarding this issue. So, what has been happening since the increment field value was implemented, is that when incrementing floating numbers, most of the time you'll get a dozen decimals instead of the actual number. // incrementing 0, with 0.1, 11 times, returns 1.0999999999999999 Math.round( 1.0999999999999999 * 100 + Number.EPSILON ) / 100 This returns the correct number ... so I wonder, can't this be

问题 friends I just implement code for the View pager. But now I am stuck with the problem that how to fetch a collection from the firestore into a view pager. Means I have a collection in that collection I have 2 documents. each document has some parameters. I want the "mSliderImage" parameter will be fetched into a ViewPager from each and every document. My Code Some How Looks Like This. I am using some dependencies for my custom viewpager. implementation 'com.github.smarteist:autoimageslider:1

问题 I have the following firebase structure: { "company1": { "name": "Company One", "invoices": { "invoice1": { "amount": 300, "currency": "EUR", "timestamp": 1572608088 }, "invoice2": { "amount": 460, "currency": "EUR", "timestamp": 1572608088 } } } } That is to say: I have a collection companies . There is a document for each company. Each company has a subcollection invoices . Each invoice has the properties amount , currency , timestamp . Is there an efficient way of getting the sum of all