文章/答案/技术大牛

发布

社区首页 >问答首页 >使用AngularFireObject和switchMap

问使用AngularFireObject和switchMap
EN

Stack Overflow用户

提问于 2018-09-24 06:06:43

回答 4查看 4.8K关注 0票数 8

我真的不知道怎么解决这个问题。如何纠正此错误？

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‘的参数不能分配给类型'(value: User，index：=> ObservableInput<{}>’)的参数。类型'AngularFireObject‘不能分配到键入'ObservableInput<{}>’。类型'AngularFireObject‘不能分配到键入'Iterable<{}>’。属性'Symbol.iterator‘在'AngularFireObject’类型中缺失。

谢谢。

firebase-authentication

angularfire

angular

firebase

回答 4

Stack Overflow用户

发布于 2019-05-16 23:56:21

对角6这样做：

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));
   }

}

票数 17

Stack Overflow用户

发布于 2018-09-24 16:27:52

我找到了答案：

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 { 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 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)));
     }
}

谢谢大家！

票数 7

Stack Overflow用户

发布于 2019-01-03 16:08:29

对于RxJS 6及更高版本，您需要导入和使用可观察的、映射的、switchMap不同的：

admin-auth-guard.service.ts:
import { Injectable } from '@angular/core';
import { map, switchMap } from 'rxjs/operators'
import { Observable } from 'rxjs';
import { UserService } from './user.service';
import { CanActivate } from '@angular/router';
import { AuthService } from './auth.service';

@Injectable({
  providedIn: 'root'
})
export class AdminAuthGuardService 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()),
      map (appUser => appUser.isAdmin)
    )
  }
}

票数 6

页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持

原文链接：

https://stackoverflow.com/questions/52473504

复制

相似问题

问使用AngularFireObject和switchMap
EN

回答 4

Stack Overflow用户

Stack Overflow用户

Stack Overflow用户

社区

活动

圈层

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问使用AngularFireObject和switchMapEN

回答 4

Stack Overflow用户

Stack Overflow用户

Stack Overflow用户

社区

活动

圈层

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问使用AngularFireObject和switchMap
EN