How to get value in Firebase Database (Angular) by key?

Question

Greetings my objective is to get a nested value in my database by key. In this case I just want to get the Username of the current user that's logged in.

The structure of my db is as follows:

My current solution is:

this.db.list("/Users/"+this.userId).valueChanges().subscribe(details => {
  this.username = details[3]
}

I want to diverge from this approach since I don't know what more properties the user will get, and any db change will not pass the username, is there any way to search on the database by key only and get it's respective value. I am aware that the orderByChild and orderByKeys exists but I can't understand exactly how they work or if they are useful for this specific case.

can you edit with full code? what is db variable?

withoutOne
– withoutOne

2022-05-24 12:22:43 +00:00
Commented May 24, 2022 at 12:22 — withoutOne
– withoutOne, Commented May 24, 2022 at 12:22

JZoares · Accepted Answer · 2020-11-20 00:14:49Z

2

Using object instead of list I can easily access the retrieved dictionary by its key:

this.db.object("/Users/"+this.userId).valueChanges().subscribe(details => {
  this.username = details["Username"]
}

answered Nov 20, 2020 at 0:14

JZoares

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Francesco Colamonici · Accepted Answer · 2020-11-20 12:02:43Z

0

I'd rather use object:

this.db.object("/Users/" + this.userId).valueChanges()
  .subscribe(details => {
    this.username = details.Username;
  });

https://github.com/angular/angularfire/blob/master/docs/rtdb/objects.md#retrieve-data

edited Nov 20, 2020 at 12:02

answered Nov 19, 2020 at 22:34

Francesco Colamonici

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2 Comments

JZoares Over a year ago

Thank you for the reply. Using object seems to be the appropriate method, however using your code raises an Unkown Property error, the correct way to access it is by using details["Username"].

Francesco Colamonici Over a year ago

Sorry, I underestimated the capitalization. Glad to see it helped.

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