我是angular和firebase的新手，可以说我有以下服务，我正在使用angularfire2数据库
import { Injectable } from '@angular/core';
import { AngularFireDatabase, FirebaseListObservable,
FirebaseObjectObservable } from 'angularfire2/database';
import { AngularFireAuth } from 'angularfire2/auth';
import { AuthService } from '../../../services/auth.service';
@Injectable()
export class GroupsService {
user: User;
constructor(
private afAuth: AngularFireAuth,
private db: AngularFireDatabase,
) {
this.afAuth.authState.subscribe( ( loggedInUser ) => {
this.user = {
email: loggedInUser.email,
id: loggedInUser.uid
};
console.log(this.user) //getting logged in user info correctly
});
}
getGroups():FirebaseListObservable<any[]>{
console.log(this.user); //unable to get logged in user
return this.db.list('groups',{
query : {
orderByChild: 'createdBy/email',
equalTo: this.user.email
}
});
}
在getGroups()方法上，我基于登录的用户电子邮件地址来获取组，在该功能中，在console.log(this.user);我得到时undefined，请问如何解决此问题？
我通过此链接中提供的信息解决了此问题
@Injectable()
export class GroupsService {
/**
* Observable for firebase user
*/
loggedInUser$: Observable<firebase.User>;
/**
*
* @param authService
* @param db
*/
constructor(
private authService: AuthService,
private db: AngularFireDatabase,
) {
this.loggedInUser$ = authService.user.share();
}
/**
*
*/
getGroups():FirebaseListObservable<any>{
return this.loggedInUser$.mergeMap( user => {
let email = user.email;
return this.db.list('groups', {
query: {
orderByChild: 'createdBy/email',
equalTo: email
}
})
}) as FirebaseListObservable<any[]>
}
}
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我来说两句