本文介绍了使用AngularFireObject和switchMap的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
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);
}
}
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!