readProductFromServer() {
this.qS = this.afDatabase.list('product_table', ref => {
return ref.limitToLast(1000) ;
}).snapshotChanges().map(changes => {
return changes.map(c => ({ key1: c.payload.key, ...c.payload.val() }));
});
this.qS.take(1).subscribe(values => {
});
}
Is there a way to ensure that this code only reads from the server once? I've looked online for solutions, but couldn't find any that match my specific code.
When dealing with observables, if you are looking to read your data just once without receiving any additional updates, simply include take(1) in your operator chains:
this.qS = this.afDatabase.list('product_table', ref => {
return ref.limitToLast(1000) ;
}).snapshotChanges().map(changes => {
return changes.map(c => ({ key1: c.payload.key, ...c.payload.val() }));
}).take(1);
this.qS.subscribe(values => {
});
This will capture the initial emission and then complete the observable.
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