我有一个Firebase数据库构造问题.我的场景接近一个聊天应用程序.以下是具体细节
- users(node storing several users of the app)
- id1
name: John
- id2
name: Meg
- id2
name: Kelly
- messages(node storing messages between two users)
- message1
from: id1
to: id2
text: ''
- message2
from: id3
to: id1
text: ''
现在想象一下,为个人用户建立一个会话视图.所以我想要从该特定用户获取所有邮件
并对该特定用户
我现在写如下：
let fromMessagesRef = firebase.database().ref('messages').orderByChild('from').equalTo(firebase.auth().currentUser.uid)
fromMessagesRef.once("value").then((snapshot) => {/* do something here*/})
let toMessagesRef = firebase.database().ref('messages').orderByChild('to').equalTo(firebase.auth().currentUser.uid)
toMessagesRef.once("value").then((snapshot) => {/* do something here*/})
问题：
解决方法
我会存储这样的数据：
- users(node storing several users of the app)
- id1
name: John
messages
message1: true
message2: true
- id2
name: Meg
messages
message1: true
message3: true
- id3
name: Kelly
messages
message2: true
message3:true
- messages(node storing messages between two users)
- message1
from: id1
to: id2
text: ''
- message2
from: id3
to: id1
text: ''
- message3
from: id2
to: id3
text: ''
Firebase推荐存储这样的东西.所以在你的情况下你的查询是
let fromMessagesRef = firebase.database().child('users').child(firebase.auth().currentUser.uid).child('messages')
