Having an issue where Firebase Firestore is showing [object, object] instead of the expected document data. What steps should be

I have developed an application that collects user input and uploads it to firebase firestore. However, when I retrieve the documents from firestore to display on another page using a component, it shows [object, object] instead of the actual data. I am struggling to figure out how to resolve this issue. Any suggestions or advice would be greatly appreciated.

      export interface Item{
        id?: string, 
        createdAt: number,
         title: string,
       description:string,
       carType:string,
       typeID: number,
       color: string,
       colorId: number
       }

   //item.service.ts
   export class ItemService {

    //property of items collection
    itemsCollection: AngularFirestoreCollection<Item>;

     items: Observable<any[]>;


   constructor(public fsDb: AngularFirestore) { 
     this.items = this.fsDb.collection('complete- 
       entry').valueChanges();

    }

     getItems(){
     return this.items;
      }
     }

   //items.component.ts
     export class ItemsComponent implements OnInit {

        items: Item[];
     constructor(private itemService: ItemService) { }

      ngOnInit() {
        this.itemService.getItems().subscribe(items=>{
           console.log(items);
         
           this.items = items;
            })
             }}
      //items.component.html

         <div *ngIf="items?.length >0;else noItems">
           <ion-list *ngFor="let items of items" class="collection">
        <ion-item class="collection-item">
          <strong>{{items.title}}: </strong>{{items.description}}  <br>
         </ion-item>

         </ion-list>
       </div>
       <!-- if there are not items display -->
   <ng-template #noItems>
        <hr>
     <h5>There are no items to display</h5>
   </ng-template>

Answer №1

It appears that console.log is used to display data in the console, but to show items in a template, you need to follow these steps:

  1. Loop over the items using *ngFor directive
<ng-container *ngFor="let item of items">
...
</ng-container>
  1. Interpolate and access the desired properties within the loop
{{ item.id }}
{{ item.createdAt }}
// Alternatively, display the entire object for reference
{{ item | json }}

To summarize, in your template, you should have something like this:

<div *ngFor="let item of items">
    Item title : {{ item.title }}
</div>

Additionally, you can assign this.fsDb.collection().valueChanges() directly to the items property when declaring it in the service, making it easier to use in your component. 👍

You can try it out here (just input your Firebase app configuration in the AngularFireModule import): https://stackblitz.com/edit/stackoverflow-67126446?file=src/app/app.module.ts

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