How do we use angularfire2, upon saving/pushing data, to generate Firebase unique id?

[jek-bao-choo]

I'm aware that using Firebase REST we could POST and have a Firebase unique id generated. For example, a id that looks like this, -Kbz13Uo3.

1. How do we do this using AngularFire2?
2. Or maybe should we be asking is there a need to use Firebase Unique Id in the first place?
3. What is a good self generated unique id when using it with Firebase? GUID?

[davideast]

Hey @choopage!

You can generate the unique id, which we call a "push id", using the .push() method.

class MyCmp
  constructor(af: AngularFire) {
    const items = af.database.list('items');
    items.push('new item');
  }
}

[jek-bao-choo]

Heyy @davideast

Thank you for answering my question. "Push id" is what I am looking for. Just before we close this issue, could you explain following your code sample, how do we get the "push id" after doing a push?

Just in case, you are wondering why I'm doing this. I want to instantly using the push id returned from the push operation to perform routing to localhost:4200/hero/-KJDdFcQzEmyOhAHjICx

class MyCmp
  constructor(af: AngularFire) {
    const items = af.database.list('items');
    items.push('new item').then(... $key ...);

//is there a way to get the 'push id' right after the push operation?

  }
}

[kazkis]

hi @choopage , you can simply do

const newId = items.push('new item').key();

[jek-bao-choo]

Hi @kazkis,

Thank you for your answer. Perfect answer for me moving forward.

Sent from my iPhone

On 3 Jun 2016, at 05:21, kazkis [email protected] wrote:

hi @choopage , you can simply do

const newId = items.push('new item').key();

—
You are receiving this because you were mentioned.
Reply to this email directly, view it on GitHub, or mute the thread.

[jongood01]

This no longer works as the push method returns a promise. Using preserveSnapshot on the list also doesn't seem to be ideal when you want to make sure you get the key of the newly created item.

[IvRRimum]

Then how do you get the key? Why did you change such a good approach?

[IvRRimum]

This works:
items.push(yourobject).then((item) => { console.log(item.key); });

[jongood01]

@anivaisu @IvRRimum 's answer works. Firebase creates the key for you when you push an item onto a list.

[anivaisu]

hi,
How can i edit the firebase data using $key

this is my new data from firebase

-KXxxQxJCdo0pidJI1ay
EMAIL:

FIRSTNAME:john

LASTNAME:david

MOBILE: 654656767

I cannot get the data from firebase when using firebase object $key-->-KXxxQxJCdo0pidJI1ay

kindly advice me

Thanks & regards

[jesseteweehi]

@jongood01

With the answer from @IvRRimum if i use this approach and use the key to update on another location like Updating or deleting data will they be atomic???

[AnuragKDwivedi]

how to store items directly from form using angularfire2

[RikaonPessoa]

try this way:
this.firebaseApp.database().ref().child('/items'/').push().key;

don't forget import :
import { FirebaseApp } from 'angularfire2';

[wor-k]

for version 5, try
const ref = afDb.list('/items).query.ref.push(); ref.set(data); console.log(ref.key);

[flaviuj]

for version 5, you can also try:
afDb.list('/items).push(null).then(( ref )=>{
ref.push({/* your_data_here */})
})

[paean99]

For "version": "5.0.0-rc.4", this works.

const newKey = afDb.list('/items').push(newItem).key

Remark that it isn't a method like in the solution mentioned earlier.

const newId = items.push('new item').key();

edit: This one and all the earlier solutions are really the same one in different clothes...

[cwoolum]

I ended up going this route... It seemed the cleanest for what I was trying to do. I didn't like pushing the null to the collection because you can't use validations in your DB config.

This is for 5.0.0-rc4.

let receiptRef = this.receipts.push(receiptValue);
receiptRef.update({ id: receiptRef.key });

[kanafghan]

For me, having the same case as @cwoolum , the following works as of 5.0.0-rc.6:

const pushId = this.afDb.createPushId();
const item = { ...item, id: pushId };

this.afDb.list('items').set(item.id, item);

AngularFireDatabase has the createPushId() method which is not mentioned anywhere the documentation.

[paean99]

Yes, createPushId() is also what i have been using. It promotes a cleaner workflow. I only found it initially because of the intellisense of the editor. I did search the documentation for it, without success.

But the earlier solutions still have its necessity if one specifically need the key only after the push (for whatever the reason).

[PVermeer]

Is there anymore info on createPushId()? It types as createPushId(): string | null;

In what case can it be null? I cannot find anything in the src.

[yuliankarapetkov]

As mentioned in this post you can use the createdId() method:

const id = this.afs.createId();
const ref = this.afs.collection(this.collectionRef).doc(id);

[Shashidhar1998]

hi,
How can i edit the firebase data using $key

this is my new data from firebase

-KXxxQxJCdo0pidJI1ay
EMAIL:

FIRSTNAME:john

LASTNAME:david

MOBILE: 654656767

I cannot get the data from firebase when using firebase object $key-->-KXxxQxJCdo0pidJI1ay

kindly advice me

Thanks & regards

store key value in object user
this.firebase.object('/Users/' + user.$key)
.update({ username: user.username,email:user.email});