Struggling to Transform a Firebase Database Snapshot into an Array Using TypeScript

Question

Struggling to Transform a Firebase Database Snapshot into an Array Using TypeScript

I've been following this tutorial on converting a firebase snapshot into an array for my ionic application. Here is the code I am using:

You can find the code here.

Here is my data structure in firebase:

https://i.sstatic.net/xcYOv.png

However, when I run my code, I encounter this error:

https://i.sstatic.net/5hvdk.png

Upon debugging, I noticed that the first item in the snapshot is stored in the array, but the next value is undefined. Oddly enough, printing the keys works just fine:

https://i.sstatic.net/BF5Zc.png

Any insights on what might be causing this issue?

typescript firebase ionic-framework firebase-realtime-database angularfire

Answer 1

Answer №1

Within your database, there are multiple properties that are of type boolean, such as boolLogin and disponible. This is causing an error when attempting to add a key to items while using a foreach loop, as it is trying to add a key to an item with a boolean value.

To resolve this issue, consider adding the snapshots to an array using the following code:

this.consultaTutor = this.afDatabase.object(`profile/SlHGkc3ZK0hHxH2s1sowpgGuJfA3`, {preserveSnapshot: true})
this.consultaTutor.subscribe(info => {
    info.forEach(childSnapshot => {
        var value = childSnapshot.val();
        var key = childSnapshot.key;
        console.log(childSnapshot.key);
        var item = { "key" : key, "value" : value};
        this.listaTutores.push(item);      
    })

Answer 2

Within your database, there are multiple properties that are of type boolean, such as boolLogin and disponible. This is causing an error when attempting to add a key to items while using a foreach loop, as it is trying to add a key to an item with a boolean value.

To resolve this issue, consider adding the snapshots to an array using the following code:

this.consultaTutor = this.afDatabase.object(`profile/SlHGkc3ZK0hHxH2s1sowpgGuJfA3`, {preserveSnapshot: true})
this.consultaTutor.subscribe(info => {
    info.forEach(childSnapshot => {
        var value = childSnapshot.val();
        var key = childSnapshot.key;
        console.log(childSnapshot.key);
        var item = { "key" : key, "value" : value};
        this.listaTutores.push(item);      
    })

Struggling to Transform a Firebase Database Snapshot into an Array Using TypeScript

Answer №1

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