【发布时间】：2017-03-05 14:42:38
【问题描述】：
我的 Firebase 中有以下层次结构：
func invitedEvents() {
DataService.ds.REF_EVENTS.queryOrdered(byChild: "eventParticipant").observe(.childAdded, with: { (snap) in
print("KEEEY:\(snap.key)")
let value = snap.value as? NSDictionary
if snap.exists() , value?["eventParticipant"] != nil{
print("eventParticipant:\(value?["eventParticipant"])")
var valueArray = value?["eventParticipant"] as! [[String:AnyObject]]
for (index, element) in valueArray.enumerated() {
print("valueArray\(index): \(element)")
//self.selectedContacts.append(element as! Participant)
if element["partPhone"] as! String == "00 11 111 1111" {
print("KEY:\(snap.key) PHONE:\(element["partPhone"])")
self.eventKey = snap.key
print("snap.key:\(snap.key)")
//child("eventItem").child("eventOrganized").queryOrdered(byChild: snap.key).queryEqual(toValue: "1")
DataService.ds.REF_USERS.child("eventItem").child("eventOrganized").child(snap.key).observe(.value, with: { (snapshot) in
print("With Snapshot Key: \(snapshot)")
})
//DataService.ds.REF_USERS.queryOrdered(byChild: "provider").queryEqual(toValue: "email").observe(.value, with: { (snapshot) in
// print("With Provider:\(snapshot.value)")
//})
DataService.ds.REF_EVENTS.child(self.eventKey).observe(.value, with: { (snap) in
print(snap)
if snap.value is NSNull {
print("Event is not found!")
}
else {
let value = snap.value as? NSDictionary
print(value?["eventLocation"] ,
value?["eventCurrency"],
value?["eventDesc"],
value?["eventBeginDate"],
value?["eventEndDate"],
value?["eventCurrency"],
value?["eventLocation"],
value?["eventName"],
value?["eventDesc"],
value?["eventPrice"])
if
let eventAddress = value?["eventLocation"] ,
let eventCurrency = value?["eventCurrency"],
let eventDesc = value?["eventDesc"],
let eventBeginDate = value?["eventBeginDate"],
let eventEndDate = value?["eventEndDate"],
let eventImg = value?["eventCurrency"],
let eventLocation = value?["eventLocation"],
let eventName2 = value?["eventName"],
let eventNote = value?["eventDesc"],
let eventPrice = value?["eventPrice"]
{
let eventDetails = Event(
eventAddress: value?["eventLocation"] as! String,
eventCurrency: value?["eventCurrency"] as! String,
eventDesc: value?["eventDesc"] as! String,
eventBeginDate: value?["eventBeginDate"] as! String,
eventEndDate: value?["eventEndDate"] as! String,
eventImg: value?["eventCurrency"] as! String,
eventLikes: 1,
eventLocation: value?["eventLocation"] as! String,
eventName: value?["eventName"] as! String,
eventNote: value?["eventDesc"] as! String,
eventPrice: value?["eventPrice"] as! String,
eventCreated: value?["eventCreated"] as! String,
eventStatus: 0 as! Int?
)
//print(eventDetails)
let eventName = value?["eventName"] as! String
self.userPastEventNameList.append(eventName)
self.events.append(eventDetails)
print(eventAddress,eventCurrency,eventDesc, eventBeginDate, eventEndDate, eventImg, eventLocation, eventName2, eventNote, eventPrice)
}
else {
print("NULL FOUND")
}
}
DispatchQueue.main.async{
self.tableView.reloadData()
}
self.removeLoadingScreen()
})
//})
}
}
}
})
}
并且 snap.keys 在 print("snap.key:(snap.key)"):
snap.key:-KePXAuTADuTLTsZ7qbe
snap.key:-KePjqMKrARQmp-gTss-
snap.key:-KePsCS5rB4lTwy6GWea
snap.key:-KePwdRQPFFX30_GDAOK
snap.key:-KePyNVghX4MkSxI_1fx
snap.key:-KePz200QsJp6CSb3bVN
如果我正在使用它，那么我会得到一个快照：
print("snap.key:\(snap.key)")
DataService.ds.REF_USERS.queryOrdered(byChild: "provider").queryEqual(toValue: "email").observe(.value, with: { (snapshot) in
print("With Provider:\(snapshot.value)")})
结果：
With Provider:Optional({
JIbrGLdfCDUpMUOHEu7KzRye8ZK2 = {
provider = email;
};
})
如果我使用这个，那么我不会得到任何结果：
print("snap.key:\(snap.key)")
DataService.ds.REF_USERS.child("eventItem").child("eventOrganized").queryOrdered(byChild: snap.key).queryEqual(toValue: 1).observe(.value, with: { (snapshot) in ("With Snapshot Key:\(snapshot.value)")})
结果：
With Snapshot Key:Optional(<null>)
有人可以帮助我吗？我做错了什么？
【问题讨论】：
-
eventItem 和您的根目录之间缺少链接。那个 V9T3 ... 键。
-
我不明白，彼得。我应该如何编写查询？
-
我们能否看到更多您的数据库结构（因为您使用了很多我们看不到的引用）以及 REF_USERS 和 REF_EVENTS 所引用的内容？另外，在这种情况下 self.eventKey 是什么？
-
这就是我不想发布整个函数的原因。这只是令人困惑。我的问题是如何找到值为 1 的键？ self.eventkey 现在并不重要，因为我把它放在那里只是为了测试查询的那一部分。后来实际上我想使用值为1的那些键并替换self.eventkey。
-
好的，现在检查我的答案，这是你想要的吗？
标签： ios swift firebase firebase-realtime-database