使用AngularFireObject和switchMap [英] Working with AngularFireObject and switchMap
问题描述
我真的不知道该如何解决.如何解决此错误?
I really don't know how to fix this. How can I fix this error?
in user.service.ts:
import { Injectable } from '@angular/core';
import { AngularFireDatabase, AngularFireList, AngularFireObject } from 'angularfire2/database';
import {AppUser} from './models/app.user';
import * as firebase from 'firebase';
import { Observable } from 'rxjs';
@Injectable({
providedIn: 'root'
})
export class UserService {
constructor(private db: AngularFireDatabase) { }
save(user: firebase.User) {
this.db.object('/users/' + user.uid).update({
name: user.displayName,
email: user.email
});
}
get(uid: string): AngularFireObject<AppUser> {
return this.db.object('/users/' + uid);
}
in admin-auth-guard.service:
import { Injectable } from '@angular/core';
import { Observable } from 'rxjs/observable';
import 'rxjs/add/operator/switchMap';
import 'rxjs/operator/map';
import { UserService } from './user.service';
import { CanActivate } from '@angular/router';
import { AuthService } from './auth.service';
@Injectable({
providedIn: 'root'
})
export class AdminAuthGuard {
constructor(private auth: AuthService, private userService: UserService) { }
canActivate (): Observable<boolean> {
return this.auth.user$
.switchMap(user => this.userService.get(user.uid))<-- ERROR HERE
.map (appUser => appUser.isAdmin);
}
}
类型'(user:User)=> AngularFireObject'的参数不是 可分配给类型'(值:用户,索引:数字)=>的参数 ObservableInput< {}>'.类型"AngularFireObject"不是 可分配给类型"ObservableInput< {}>". 无法将类型"AngularFireObject"分配给类型"Iterable< {}>". 类型"AngularFireObject"中缺少属性"[Symbol.iterator]".
Argument of type '(user: User) => AngularFireObject' is not assignable to parameter of type '(value: User, index: number) => ObservableInput<{}>'. Type 'AngularFireObject' is not assignable to type 'ObservableInput<{}>'. Type 'AngularFireObject' is not assignable to type 'Iterable<{}>'. Property '[Symbol.iterator]' is missing in type 'AngularFireObject'.
谢谢.
推荐答案
对Angular 6这样做:
Do it this way for Angular 6:
user.service.ts:
import { Injectable } from '@angular/core';
import { AngularFireDatabase, AngularFireObject } from 'angularfire2/database';
import {AppUser} from './models/app.user';
import * as firebase from 'firebase';
import { Observable } from 'rxjs';
@Injectable({
providedIn: 'root'
})
export class UserService {
constructor(private db: AngularFireDatabase) { }
save(user: firebase.User) {
this.db.object('/users/' + user.uid).update({
name: user.displayName,
email: user.email
});
}
get(uid: string): AngularFireObject<AppUser> {
return this.db.object('/users/' + uid);
}
}
In admin-auth-guard.service.ts:
import { UserService } from './user.service';
import { map, switchMap } from 'rxjs/operators';
import { AuthService } from './auth.service';
import { Injectable } from '@angular/core';
import { CanActivate } from '@angular/router';
import { Observable } from 'rxjs';
@Injectable({
providedIn: 'root'
})
export class AdminAuthGuard implements CanActivate {
constructor(private auth: AuthService, private userService: UserService) { }
canActivate(): Observable<boolean> {
return this.auth.user$
.pipe(switchMap(user => this.userService.get(user.uid).valueChanges()))
.pipe(map(appUser => appUser.isAdmin));
}
}
这篇关于使用AngularFireObject和switchMap的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!