Firebase查询等于无效 [英] Firebase queryEqual doesn't work
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问题描述
我的Firebase中具有以下层次结构:
I have the following hierarchy in my Firebase:
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()
})
//})
}
}
}
})
}
和snap.keys在print("snap.key:(snap.key)"):
and snap.keys are in 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，那么会得到一个快照:
If I'm using this, then I get a snapshot:
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;
};
})
如果我正在使用它，那么我不会得到任何结果:
If I'm using this, then I don't get any result:
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?我在做什么错了?
Somebody could help me? What am I doing wrong?
推荐答案
对，
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)")})
这不起作用，因为您缺少对V9T3cEgEGPRmlkMQb32hxa5gG7L2节点的引用.
That doesn't work because you're missing a reference to the V9T3cEgEGPRmlkMQb32hxa5gG7L2 node.
如果要在该键下将所有eventOrganized节点的值都设置为1，则需要使用以下查询.
If you want all the eventOrganized nodes with a value of 1 under that key then you need to use the following query.
DataService.ds.REF_USERS.child("V9T3cEgEGPRmIkMQb32hxa5gG7L2").child("eventItem").child("eventOrganized").queryOrderedByValue().queryEqual(toValue: 1).observe(.value, with: { (snapshot) in
print("Snapshot Value:\(snapshot.value)")
})
很显然，您不想直接引用V9T3cEgEGPRmlkMQb32hxa5gG7L2，出于可重用性的考虑，应将此密钥存储在变量中(也许您有，我无法在代码中告诉您).我想这就是您想要的.
Obviously you don't want to reference V9T3cEgEGPRmlkMQb32hxa5gG7L2 directly, you should store this key in a variable for reusability's sake (maybe you have, I can't tell in your code). I think that's what you wanted.
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