[英]How to query all children with Firebase Realtime Database
我正在尝试让云函数查询我的实时数据库
我的结构:
devices_token
-LuYV_1o8E6hC1hF-STo
fcmToken:fFLk85eSHyk:APA91bHjRHP0aVH72r0GOeV51nUfpt-REYO..."
-LuZwn7CQ3SVDWep9aOq
fcmToken:"fFLk85eSHyk:APA91bHjRHP0aVH72r0GOeV51nUfpt-REYO..."
我的代码:
app.post('/', (req, res) => {
let {title, id} = req.body;
admin
.database()
.ref('/devices_token/{push_id}')
.on('value', snapshot => {
const val = snapshot.val();
console.log(val);
});
});
我得到了null
我已经解决了
admin
.database()
.ref('/devices_token')
.once('value', snapshot => {
snapshot.forEach(function(data) {
let val = data.val();
push_token.push(val.fcmToken);
});
})
您不能在实时数据库引用中使用通配符。 相反,我认为您想要在这里做的只是像这样在/devices_token
获取整个树:
app.post('/', (req, res) => {
let {title, id} = req.body;
admin
.database()
.ref('/devices_token')
.once('value', snapshot => {
const val = snapshot.val();
console.log(val); // {"-LuYV_...":{"fcmToken":"..."},"...":{...}}
});
});
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