Firebase 按子值搜索 [英] Firebase search by child value

问题描述

我的 Firebase 数据库具有以下结构:

I have the following structure on my Firebase database:

我想按姓名、姓氏或电子邮件搜索用户，但由于我没有以上级别的用户密钥，我不知道如何实现这一点.我正在和管理员进行会话，因此它无法访问用户密钥.

I would like to search for an user by name, last name or email but as I don't have the user key in the level above I don't know how I can achieve this. I'm doing and administrator session so it wouldn't have access to the user key.

我试过了:

let usersRef = firebase.database().ref('users');
usersRef.orderByValue().on("value", function(snapshot) {
    console.log(snapshot.val());
    snapshot.forEach(function(data) {
        console.log(data.key);
    });
});

但它带来了数据库上的所有用户.有什么想法吗?

But it brings all the users on the database. Any ideas?

推荐答案

您可以使用 equalTo() 按值查找任何子项.在你的情况下，name:

You can use equalTo() to find any child by value. In your case by name:

ref.child('users').orderByChild('name').equalTo('John Doe').on("value", function(snapshot) {
    console.log(snapshot.val());
    snapshot.forEach(function(data) {
        console.log(data.key);
    });
});

orderByChild() 的目的是定义要过滤/搜索的字段.equalTo() 可以获取字符串、整数和布尔值.

The purpose of orderByChild() is to define the field you want to filter/search for. equalTo() can get an string, int and boolean value.

也可以与自动生成的密钥 (pushKey) 一起使用.

Also can be used with auto generated keys (pushKey) too.

您可以在此处

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