搜索子值 Firebase/Swift [英] Searching through child values Firebase / Swift

问题描述

我的数据库有这样排序的值:

My database has values sorted like this :

 Users
    UID
      Username
      Email

我想要实现一个朋友添加系统，您可以在其中搜索用户名或电子邮件，然后添加此人.

I'm wanting to implement a friend adding system where you search for either a username or email and it lets you add the person.

我可以使用

 REF_USERS.queryOrdered(byChild: "displayname").queryEqual(toValue: input).observeSingleEvent(of: .value) { (snapshot: FIRDataSnapshot) in {
 print(snapshot.value)
}

这样我就得到了用户的整个字典，但是我在获取 UID 时遇到了问题.

With that I get the user's entire dictionary, but I'm having an issue grabbing the UID.

snapshot.key 给我用户".

snapshot.key gives me "Users".

在使用用户名/电子邮件找到用户的字典后，如何从字典中获取 UID 值?

How can I grab the UID value out of the dictionary after finding the user's dictionary with either their username/email?

推荐答案

当您对 Firebase 数据库执行查询时，可能会有多个结果.所以快照包含这些结果的列表.即使只有一个结果，快照也会包含一个结果列表.

When you execute a query against the Firebase Database, there will potentially be multiple results. So the snapshot contains a list of those results. Even if there is only a single result, the snapshot will contain a list of one result.

let query = REF_USERS.queryOrdered(byChild: "displayname").queryEqual(toValue: input)
query.observeSingleEvent(of: .value) { (snapshot: FIRDataSnapshot) in {
    for child in snapshot.children {
        print(child.key)
    }
}

另见:

• Firebase snapshot.key 没有返回实际密钥?
• queryOrderBy 中的 Firebase 访问键
• queryOrderBy 中的 Firebase 访问键
• Firebase 按顺序获取数据

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