我正在使用Google的Firebase的实时数据库,我正在尝试检查一个小孩是否存在.
我的数据库的结构如下
- / (root) - /users/ –- /james/ -- /jake/ - /rooms/ -- /room1/ --- (room 1 properties) -- /room2/ --- (room 2 properties)
我想检查room1是否存在.
我已经尝试过以下内容：
let roomName:String = "room1"
roomsDB.child(roomName).observeSingleEventOfType(.Value) {
(snap:FIRDataSnapshot) in
let roomExists:Bool = snap.value != nil ? "TAKEN" : "NOT TAKEN"
}
在访问snap.value时,它返回该房间的属性的JSON,但是如何检查房间(/ rooms / room1 /)是否开始？
评论如果需要澄清
self.ref = FIRDatabase.database().reference()
ref.child("rooms").observeSingleEventOfType(.Value,withBlock: { (snapshot) in
if snapshot.hasChild("room1"){
print("true rooms exist")
}else{
print("false room doesn't exist")
}
})
