Can’t use variable for angularfire2 list name in firebase(ionic)

Question

I can’t use a variable to hold the name of my list on firebase.

After I push some data the variable becomes undefined in firebase.

$this.UserID is meant to hold the UID but it can't be read.

My code:

private referenceListRef;
UserID: string;

constructor(private http: Http, 
            private db: AngularFireDatabase,
            private ofAuth: AngularFireAuth,
            public storage: Storage
) {
    this.ofAuth.authState.take(1).subscribe(data => {
        this.UserID = data.uid;
        console.log(`user id : ${this.UserID}`);
    })
    this.referenceListRef =  this.db.list(`${this.UserID}`);
 
}

im sorry, i was kinda confused as what to type, or to ask so perhaps the question was a bit confusing. and again english isn't my main language. so thank you so much for editing that post. now that looks like a proper question! — kevin parcour
– kevin parcour, Commented Dec 28, 2017 at 14:45

Makah · Accepted Answer · 2017-12-28 21:09:42Z

1

You need to add referenceListRef inside subscribe(), because you don't have this.UserID before this.ofAuth.authState Observable's completes.

private referenceListRef;
UserID: string;

constructor(private http: Http, 
            private db: AngularFireDatabase,
            private ofAuth: AngularFireAuth,
            public storage: Storage
) {
    this.ofAuth.authState.take(1).subscribe(data => {
        this.UserID = data.uid;
        console.log(`user id : ${this.UserID}`);
        this.referenceListRef =  this.db.list(`${this.UserID}`); // <-- This code
    })
}

answered Dec 28, 2017 at 21:09

Makah

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2 Comments

kevin parcour Over a year ago

thanks! i tried it but unfortunately now i get this error "cannot read property snapshotchanges of undefined"

kevin parcour Over a year ago

wait, turns out if i click close after the error, which will send me back to the login page and i re-login, it works. but somehow if i restart the app the errorwill come out again. so i have to close the error message and re login. but hey it worked! thanks!

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