我有一个正在存储在数据库中的事件。它存储为
events
my_party123
info
-KZbdiR_PBrAwxYvUR4U
name: 'John'
city: 'Los Angeles'
my_party124
...
但是,我正在尝试检索此信息,但我无法完全了解。
我尝试了
ref
.child('events')
.child('my_party123') // I also tried .push('my_party123')
.once('value')
.then(snapshot => {
console.log(snapshot.key) // my_party123
console.log(snapshot.val().info)
// this shows object with
// "-KZbdiR_PBrAwxYvUR4U" property, this is the pushed key property
im trying to access
})
.pushed
在我打电话时正在创建新密钥 - 如何访问数据库中存储的值?
如果您想在事件上指出唯一的事件URL,我建议您对数据结构进行更改,以更像:
events
-KZ123PUSHID
name: 'John'
location: 'Los Angeles'
-KZ124PUSHID
name: 'Morgan'
location: 'New York City'
eventNames
my_party_123: '-KZ123PUSHID'
sweet_nyc_part: '-KZ124PUSHID'
然后,在您的代码中,您可以执行以下操作:
var eventNamesRef = firebase.database().ref('eventNames');
var eventsRef = firebase.database().ref('events');
var event;
eventNamesRef.child(nameFromUrl).once('value').then(nameSnap => {
eventsRef.child(nameSnap.val()).on('value', eventSnap => {
event = eventSnap.val();
});
});