Warning: The value returned by this.profileService.getUserProfile(...) does not exist

My challenge involves setting up a profile page with options to update username, password, and email. I've managed to get the "change email" and "change password" functions working smoothly. However, when I try to apply the same method to "change name", it seems to be causing issues.

I attempted to use the safe navigation operator (?) but unfortunately, that didn't solve the problem. I would greatly appreciate any guidance on where I might be going wrong.

Here is a snippet of the code I'm working with:

import { NgModule } from '@angular/core';
import { CommonModule } from '@angular/common';
import { FormsModule } from '@angular/forms';
{...}
export class ProfilePageModule {}

Next, here is the HTML code for the profile page:

<ion-header>
{...}
</ion-content>

Moving on to the TypeScript code for the profile page:

import { Component, OnInit } from '@angular/core';
{...}
export class ProfilePage implements OnInit {
{...}
}

Lastly, here is the service handling the profile functionalities:

import { Injectable } from '@angular/core';
{...}
export class ProfileService {
{...}
}

The error messages I'm encountering are:

ERROR TypeError: "this.profileService.getUserProfile(...) is undefined"

ERROR Error: "Uncaught (in promise): TypeError: this.userProfile is undefined

Answer №1

During the initialization of your profile component, the ngOnInit lifecycle hook is triggered:

ngOnInit() {
    this.profileService
      .getUserProfile()
      .get()
      .then( userProfileSnapshot => {
        this.userProfile = userProfileSnapshot.data();
        this.birthDate = userProfileSnapshot.data().birthDate;
      });
  }

However, the method "getUserProfile" in your profile service is still undefined because you are only returning a variable with a defined type but no value:

getUserProfile(): firebase.firestore.DocumentReference {
  return this.userProfile;
}

This is due to the fact that the method to assign a value to this.userProfile is asynchronous:

constructor() {
    firebase.auth().onAuthStateChanged(user => {
    if (user) {
      this.currentUser = user;
      this.userProfile = firebase.firestore().doc(`/userProfile/${user.uid}`);
    }
  });

Therefore, the user value is not yet returned while your lifecycle hook is already trying to access userProfile.

UPDATE:

To resolve this issue, you need to ensure that a promise is assigned and proper "awaiting" takes place:

In your service, define userProfile and currentUser as Promises:

public userProfile: Promise<any>;
public currentUser: Promise<any>;

In your constructor, do the following:

this.currentUser = new Promise(async (resolve,reject)=>{
  let user = await firebase.auth().onAuthStateChanged();
  resolve(user)
})
this.userProfile = new Promise(async (resolve,reject)=>{
  let user = await this.currentUser;
  let userProfile = firebase.firestore().doc(`/userProfile/${user.uid}`);
})

Now, your methods should return promises instead of undefined variables. Please verify this. I was unable to test the code, but I created a similar test case and it should work. Additionally, ensure to address the returned types:

getUserProfile(): Promise<any> {
  return this.userProfile;
}

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