删除Firebase中的节点 [英] delete node in firebase
问题描述
开始阅读文档和其他文章,但是我无法删除节点.我试图通过一个值选择节点.
been reading docs and other posts but I am unable to remove a node. I am attempting to select the node by a value.
var eventContactsRef = firebase.database().ref('events-contacts');
eventContactsRef.orderByChild('eventContactId').equalTo(eventContactId);
然后在结果上调用remove方法
then call the remove method on the result
eventContactsRef.remove(function (error) {
console.log(error);
});
除了错误值null之外,什么都没有发生.我使用的是最新的Firebase,大多数示例适用于旧版本,因此我不确定是否需要获取密钥,然后尝试删除该密钥作为参考?
nothing happens except a null error value. I am using the latest firebase, most examples are for older versions so I am unsure if I need to get the key and then attempt to delete with that as a reference?
这是第一次使用Firebase,因此我不确定是否正确保存了数据.这是要保存的代码.
This is the first time using firebase so I am not sure if I have saved the data correctly. here is code to save.
var key = firebase.database().ref().child('event-contacts').push().key;
var url = firebase.database().ref('/event-contacts/' + key);
url.set(eventContacts);
和屏幕截图
推荐答案
您无法删除查询本身.您只能删除与查询匹配的结果.
You cannot remove a query itself. You can only remove the results that match a query.
var eventContactsRef = firebase.database().ref('events-contacts');
var query = eventContactsRef.orderByChild('eventContactId').equalTo(eventContactId);
query.on('child_added', function(snapshot) {
snapshot.ref.remove();
})
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