在ionic3上使用firebase时获取密钥

Question

I'm using firebase on my ionic project. You can see my dataset on firebase with the following image.

I want to get the $key to update the specific data. How can i get it?

You can check my code how to get datas from firebase.

getPaymentsFromArchive() {
    const userid = this.authData.showUser().uid;
    let profileData: any[] = [];

this.angularFireDatabase.list(`/users/${userid}/userPayments/${this.selectedYears}/${this.selectedMonths}/userSubscriptions`).subscribe(data => {
        profileData = data;
      });
}

I want to get $key: "-L-hLB5VKoYRxKEvlNYj"

Answer 1

If you want all the keys in userSubscriptions this should work.

this.angularFireDatabase.list('/users/${userid}/userPayments/${this.selectedYears}/${this.selectedMonths}/userSubscriptions').subscribe(data => {
    profileData = data;    
    profileData.map(item => {
       console.log(item.$key);
    })
});