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var ref = firebase.database().ref('/path/to/items/');var now = Date.now();var cutoff = now - 2 * 60 * 60 * 1000;
var old = ref.orderByChild('timestamp').endAt(cutoff).limitToLast(1);var listener = old.on('child_added', function(snapshot) {
snapshot.ref.remove();});child_addedvaluelimitToLast(1)child_added
更新
exports.deleteOldItems = functions.database.ref('/path/to/items/{pushId}').onWrite((change, context) => {
var ref = change.after.ref.parent; // reference to the items
var now = Date.now();
var cutoff = now - 2 * 60 * 60 * 1000;
var oldItemsQuery = ref.orderByChild('timestamp').endAt(cutoff);
return oldItemsQuery.once('value', function(snapshot) {
// create a map with all children that need to be removed
var updates = {};
snapshot.forEach(function(child) {
updates[child.key] = null
});
// execute all updates in one go and return the result to end the function
return ref.update(updates);
});});/path/to/items
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