ionic3 - ERROR Error: Uncaught (in promise): Error: InvalidPipeArgument: '[object Object]' for pipe 'AsyncPipe'

Question

I did a news comment function by ionic3 with firebase, after testing comment function working already, but when I want the comment showing in my project error coming out.

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Answer 1

You need to first convert the AngularFireList to an Observable :

contactsList: Observable;

And in your constructor, you need to call valueChanges() on it. This is since AngularFire2 Version 5.

this.contactsList = this.firebaseService.getContactsList().valueChanges();

This will return the data through the observable without $key or $value. In order to print in html,use

  {{contact}}

instead of

  {{contact.$value}}