angularfire2

问题 I need to get a subset from a firebase list. Let's say I have two sets: set1 = { dog:true, cat:true, snake:true, bull:true } and set2 = { dog:true, cat:true } What I need is to get the "in set1, but not in set2", in this case it would return: setresult = { snake:true, bull:true } I tried to achieve this with map: this.setresult = this.af.database.list('/set2/').map((animals) => { return animals.map((animal) => { if (auth.uid == _user.$key || af.database.object('set2/' + animal.$key) == null)

问题 I am creating an app using angular 4.0.2, angularfire2, and firebase, off course. What the problem is I am not able to use the data from angularfire2 and set it as default input value of an input used in model-driven or reactive form. Here is my code for add-invoice.component.ts ngOnInit(){ const datafetch = firebase.database().ref().child('/invoices').orderByKey().limitToLast(1).once('value').then(snapshot => { const names = []; snapshot.forEach(function(childSnapshot) { var childKey =

问题 here is my code to check a doc is there in the collections this.shopCollection = this.afs.collection<Shop>('shops', ref => { return ref.where('fulladdress', '==', myString) }); i don't know why i can't use .then() and .catch() with this method. When i pass a string to query and if no result found how i know? I am using angularfire2 version ^5.0.0-rc.1 with angular ^4.2.4 and firebase ^4.5.0 . Please help. 回答1: I got it working with some changes Here is my code this.afs.collection<Shop>('shops

问题 I am selecting from following list: <ion-select multiple="true" okText="Select" cancelText="Cancel" required [(ngModel)]="retailerItemModel" formControlName="retailerItem" name="retailerItem"> <ion-option *ngFor="let item of itemList | async" [value]="item.itemPrice"> {{item.itemName}}  Rs.{{item.itemPrice}} </ion-option> </ion-select> I am calculating the totalValue with item.itemPrice as [value] (mentioned above) but I want to fetch the item.itemName too.. I am getting correct value of

问题 const placeId = this.getPlaceId(); this.af.database.list(`placeUsers/${placeId}`).subscribe((userKeys) => { for (let index = 0; index < userKeys.length; index++) { let userKey = userKeys[index]; this.af.database.list(`userDevices/${userKey.$key}`).subscribe((deviceKeys) => { for (let index = 0; index < deviceKeys.length; index++) { let deviceKey = deviceKeys[index]; this.af.database.object(`devices/${deviceKey.$key}`).subscribe((device) => { console.log(device); // Device received. }); } });

问题 I have a problem due to my config data being loaded at runtime and AnuglarFire2 wanting the data in the module declaration. I can access the data via direct injection, but I cannot figure out how to get the data to AngularFireModule in my module file. Having the data loaded at runtime is the preferred way to get configuration data to the app. So, I cannot change this process. Therefore, I need to come up with a solution to the problem. AngualrFire2 Setup Page https://github.com/angular

问题 Is it possible to sort values descending using Firebase in Angular2? In my example I want to use the timestamp field as the sort value. I have tried with this approach but haven't been succesfull in sorting it descending. this.items = af.database.list('/items', { query: { orderByChild: 'timestamp' } }); One option I can think of would be pushing these values to a new array as they arrive and then return that array but that seems suboptimal. 回答1: I'm not familiar with Firebase queries, but if

问题 Hi im new at angularfire2. Im trying to connect objects to an array (list) based on $key values. my current code looks like: console.log("Create Relationship Person 2 Person Observable"); const relationshipP2Ps$: FirebaseListObservable<any> = af.database.list('/relationshipP2P') // Primary list .map(items => { // `items` is an array of all items at the moment for (let item of items) { // Find each corresponding associated object and store it as a FibrebaseObjectObservable const i:

问题 I want to call a httpsCallable function in my Ionic 3 app. I am attempting to follow these docs: https://firebase.google.com/docs/functions/callable I tried: const newGame = (firebase as any).functions().httpsCallable('findCreateGame'); newGame({}).then(function(result) { console.log("In here."); }); Which resulted in: ERROR TypeError: WEBPACK_IMPORTED_MODULE_5_firebase_functions .functions is not a function I also tried the newly implemented wrapper in angularfire: const newGame = this

问题 I am using AngularFire2 (Ionic2) and Firebase Authentication. I am having a problem trying to get the current user. The works for me, but inconsistently. Sometimes it is populated, and sometimes it is null. let user: firebase.User = firebase.auth().currentUser; Is there a way to get the current user more consistently? More Info: I am logging in as follows: import { FirebaseAuth, AuthProviders, AuthMethods } from 'angularfire2'; public auth: FirebaseAuth this.auth.login({ provider: