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Q:
AngularFire2: Get items inside an array
i have a Firebase collection that i’m populating.
I’d like to print the name of each item inside an array.
list.component.ts
export class ListComponent implements OnInit {
collection: any;
listItems: any[];
constructor(private afs: AngularFirestore) { }
ngOnInit() {
this.collection = this.afs.collection(‘list’, ref => ref.orderBy(‘__name’, ‘ASC’));
this.collection.snapshotChanges().subscribe(
changes => {
const listSnap = changes.map(c => ({
id : c.payload.doc.id,
…c.payload.doc.data()
}));
//this.listItems = listSnap;
console.log(listSnap);
console.log(listSnap[0].data());
this.listItems = listSnap;
console.log(listItems);
}
)
}
list.component.html
{{item.data}}
But i get an error:
ERROR TypeError: this.listItems.map is not a function
A:
Moral of the story: always declare collection when you use it 🙂
this.collection = this.afs.collection(‘list’, ref => ref.orderBy(‘__name’, ‘ASC’));
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Dec. 24,
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http://colab.research.google.com/drive/1MhgSJdy4A1q7RSpgnCuL0URw9ouOfsT5
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http://colab.research.google.com/drive/1jtaXE32VQtItWC9hBSWjHn8l91AE4cI1
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