buscarAmigosObservable() {
    return this.firebaseOff.list(this.refPessoa + '/' + window.localStorage.idUserFirebase + '/amigoList/')
      .switchMap(amigoKeyList => {
        let memberObservables = [];
        amigoKeyList.forEach(amigo => {
          memberObservables.push(this.firebaseOff
            .object(this.refPessoa + '/' + amigo.$key).map(res => {
               return res.fgFavorito = amigo.fgFavorito
            }))
        })
        return memberObservables.length > 0 ? Observable.combineLatest(...memberObservables) : Observable.of([]);
      })
  }