Firebase queryEqual不起作用 [英] Firebase queryEqual doesn't work
问题描述
我在Firebase中拥有以下层级结构:
func requestedEvents(){
DataService.ds.REF_EVENTS.queryOrdered(byChild:eventParticipant ).observe(.childAdded,with:{(snap)in
print(KEEEY:\(snap.key))
let value = snap.value as?NSDictionary
如果snap.exists(),value?[eventParticipant]!= nil {
print(eventParticipant:\(value?[eventParticipant]))
var valueArray = value? ()valueArray.enumerated(){
print(valueArray \(index):\(element)中的(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)
$ b $在
print(有快照键(Snapshot Key))中的DataService.ds.REF_USERS.child(eventItem)。child(eventOrganized)。child(snap.key).observe(.value, :\(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,其中:{(snap)in
print(snap)
如果snap.value是NSNull {
print(Event is not found!)
}
else {
let value = snap.value为? 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],
让eventCurrency = value?[eventCurrency],
让eventDesc = value?[eventDesc],
让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!字符串,
eventBeginDate:value?[eventBeginDate] as! String,
eventEndDate:value?[eventEndDate] as! String,
eventImg:value?[eventCurrency] as!字符串,
eventLikes:1,
eventLocation:value?[eventLocation] as!字符串,
eventName:value?[eventName] as!字符串,
事件注意:value?[eventDesc] as! String,
eventPrice:value?[eventPrice] as!字符串,
eventCreated:value?[eventCreated] as!字符串,
eventStatus:0 as!诠释?
)
// 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 )
}
其他{
print(NULL FOUND)
$ b DispatchQueue .main.async {
self.tableView.reloadData()
}
self.removeLoadingScreen()
})
//})
$ b}
})
}
(snap.key:(snap.key)):
snap。键:-KePXAuTADuTLTsZ7qbe
snap.key:-KePjqMKrARQmp-gTss-
snap.key:-KePsCS5rB4lTwy6GWea
snap.key:-KePwdRQPFFX30_GDAOK
snap.key:-KePyNVghX4MkSxI_1fx
snap.key:-KePz200QsJp6CSb3bVN
如果我使用这个,那么我得到一个快照:< (snap.key:\(snap.key))
DataService.ds.REF_USERS.queryOrdered (byChild:provider)。queryEqual(toValue:email)。在$ b $ print(With Provider:\(snapshot.value))})中察看(.value,
结果:
提供者:可选({
JIbrGLdfCDUpMUOHEu7KzRye8ZK2 = {
provider = email;
};
$ b如果我使用这个,那么我没有得到任何结果:
$ p $ print(snap.key:\(snap.key))
DataService.ds.REF_USERS (快照键:\\)中的{(快照)).queryEqual(toValue:1).observe(.value, \\(snapshot.value))})
结果:
带有快照键:可选(< null>)
有人可以帮我吗?
pre > 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))})
这是行不通的,因为你缺少对V9T3cEgEGPRmlkMQb32hxa5gG7L2节点的引用。
如果你想让所有的eventOrganized节点的值为1,那么你需要使用以下查询。
DataService.ds.REF_USERS.child(V9T3cEgEGPRmIkMQb32hxa5gG7L2)。child(eventItem) (Snapshot Value:\(snapshot.value)).child(eventOrganized)。queryOrderedByValue()。queryEqual(toValue:1).observe(.value,with:{(snapshot)in
print
))
显然你不想直接引用V9T3cEgEGPRmlkMQb32hxa5gG7L2,是可重用性的一个变量的关键(也许你有,我不能告诉你的代码)。我想这就是你想要的。
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()
})
//})
}
}
}
})
}
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
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)")})
Result:
With Provider:Optional({
JIbrGLdfCDUpMUOHEu7KzRye8ZK2 = {
provider = email;
};
})
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)")})
Result:
With Snapshot Key:Optional(<null>)
Somebody could help me? What am I doing wrong?
Right,
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)")})
That doesn't work because you're missing a reference to the V9T3cEgEGPRmlkMQb32hxa5gG7L2 node.
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)")
})
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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