[AngularFire 2] Object Observables

In this lesson we are going to learn how to use AngularFire 2 to query objects, and read them from the Firebase realtime database.

    const course$: FirebaseObjectObservable<any> = af.database.object('courses/-KT0LsbuhHZGr5F4v7OV');
    course$.subscribe((c)=> {
      console.log("c", JSON.stringify(c, null, 2))
    });

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