Firebase queryEqual不起作用

我在Firebase中拥有以下层次结构：

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() }) //}) } } } }) } 

和snap.keys在打印（“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 

如果我使用这个，那么我得到一个快照：

 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，那么我没有得到任何结果：

  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>) 

有人可以帮我吗？ 我究竟做错了什么？

Answer 1

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less对V9T3cEgEGPRmlkMQb32hxa5gG7L2节点的引用。

如果您希望所有的eventOrganized节点的值为1，那么您需要使用以下查询。

 DataService.ds.REF_USERS.child("V9T3cEgEGPRmIkMQb32hxa5gG7L2").child("eventItem").child("eventOrganized").queryOrderedByValue().queryEqual(toValue: 1).observe(.value, with: { (snapshot) in print("Snapshot Value:\(snapshot.value)") }) 

显然你不想直接引用V9T3cEgEGPRmlkMQb32hxa5gG7L2，你应该把这个密钥存储在一个variables中，以便重用（也许你有，我不能告诉你的代码）。 我想这就是你想要的。