Categories
firebase firebase-realtime-database ios swift

Firebase Query snapshot nil?

I’m creating a simple chat app to learn Swift and Firebase. I have a query that checks for a chat room’s messages to load into a tableView. The query returns a snapshot but I’m having trouble getting the data to store and load it properly. I created a dictionary from the snapshot so I can get the individual child values but they are returning nil:

query.observeSingleEvent(of: .childAdded, with: { snapshot in
print(snapshot)
let indexPaths = self.messages.enumerated().map {
IndexPath(row: $0.0, section: 0)
}
guard let messagesDict = snapshot.value as? [String:AnyObject] else { return }
guard let sender = messagesDict["sender"] as? String else { return }
guard let text = messagesDict["text"] as? String else { return }
guard let timestamp = messagesDict["timestamp"] as? Int else { return }
let message = Message.init(key: snapshot.key, sender: sender as! String, text: text as! String, timestamp: timestamp)
self.messages.append(message)
self.tableView.reloadData()
})

po messagesDict returns data at the breakpoint:

▿ 1 element
▿ 0 : 2 elements
- key : "-KotqLUUucaRagTRt967"
▿ value : 3 elements
▿ 0 : 2 elements
- key : sender
- value : eGTYRSo81JefgasYLRHUFHUTnEC3
▿ 1 : 2 elements
- key : text
- value : test
▿ 2 : 2 elements
- key : timestamp
- value : 1499914135546

The app gets to the next breakpoint where I set guard let sender but the app hits return and stops executing the rest of the block of code. How do I properly access sender, text, and timestamp elements so I can set them to variables and store them in the array for my table?

Any help would be greatly appreciated. I’ve been stuck on this for a while and I could use another pair of eyes!

Thanks!!

Additional info:

Query:

let query = rootRef.child("chat-messages/\(chatKey)")

Database structure:

{
"chat-messages" : {
"-KotqKI4zF9cS5XMR9WU" : {
"-KotqLUUucaRagTRt967" : {
"sender" : "eGTYRSo81JefgasYLRHUFHUTnEC3",
"text" : "test",
"timestamp" : 1499914135546
}
},
"-KotqvBoFFzOTY6Q1fO7" : {
"-KotqwGAJ85NuAp-Lh3Z" : {
"sender" : "eGTYRSo81JefgasYLRHUFHUTnEC3",
"text" : "test",
"timestamp" : 1499914290279
}
},
"-KotsNgF0ou5MIDn2l5K" : {
"-KotsOSXw7OS_3xuXZgP" : {
"sender" : "eGTYRSo81JefgasYLRHUFHUTnEC3",
"text" : "test",
"timestamp" : 1499914671997
},
"-KotsPqrCpipMLulNNFl" : {
"sender" : "eGTYRSo81JefgasYLRHUFHUTnEC3",
"text" : "test44",
"timestamp" : 1499914677715
}
},
"-Kotsv1Vv19dEF2q7XQu" : {
"-KotsvYO9JvLY8gdTnA0" : {
"sender" : "eGTYRSo81JefgasYLRHUFHUTnEC3",
"text" : "test",
"timestamp" : 1499914811675
},
"-KotsvxKXzIwbyvbwLPp" : {
"sender" : "eGTYRSo81JefgasYLRHUFHUTnEC3",
"text" : "test",
"timestamp" : 1499914813335
},
"-Kotsw9vLiEf6KquU__e" : {
"sender" : "eGTYRSo81JefgasYLRHUFHUTnEC3",
"text" : "test",
"timestamp" : 1499914814205
},
"-KotswHnzmfkEXih1O7y" : {
"sender" : "eGTYRSo81JefgasYLRHUFHUTnEC3",
"text" : "test",
"timestamp" : 1499914814709
},
"-KotszHKBt254jZnUMAl" : {
"sender" : "eGTYRSo81JefgasYLRHUFHUTnEC3",
"text" : "test46456",
"timestamp" : 1499914826967
}
},
"-KoyheS01YxWExSNxl_H" : {
"-Koyhf3G-FPEDrxQOcpU" : {
"sender" : "eGTYRSo81JefgasYLRHUFHUTnEC3",
"text" : "test",
"timestamp" : 1499995746607
}
},
"-Koyjc_aBaF1kFE-8Bll" : {
"-Koyjd9PnO6sPOhS7P27" : {
"sender" : "eGTYRSo81JefgasYLRHUFHUTnEC3",
"text" : "test",
"timestamp" : 1499996263096
},
"-KoyjdzSEi5twTVQMGOu" : {
"sender" : "eGTYRSo81JefgasYLRHUFHUTnEC3",
"text" : "test",
"timestamp" : 1499996266491
},
"-Koyje2C9E524kV7nhLY" : {
"sender" : "eGTYRSo81JefgasYLRHUFHUTnEC3",
"text" : "test",
"timestamp" : 1499996266730
}
},
"-KpfUGw45F1FU2IrR87A" : {
"sender" : "eGTYRSo81JefgasYLRHUFHUTnEC3",
"text" : "test",
"timestamp" : 1500746948396
},
"-KpfUHQGuTDi4yZutS5K" : {
"sender" : "eGTYRSo81JefgasYLRHUFHUTnEC3",
"text" : "test",
"timestamp" : 1500746950368
},
"-KpfUHdSXeTzauATsDAP" : {
"sender" : "eGTYRSo81JefgasYLRHUFHUTnEC3",
"text" : "test",
"timestamp" : 1500746951277
},
"-Kpfia0fXsoqpRtIr1kU" : {
"sender" : "eGTYRSo81JefgasYLRHUFHUTnEC3",
"text" : "gerg",
"timestamp" : 1500750962815
}
},
"chat-participants" : {
"-KotqKI4zF9cS5XMR9WU" : {
"eGTYRSo81JefgasYLRHUFHUTnEC3" : {
"username" : "tester"
}
},
"-KotqvBoFFzOTY6Q1fO7" : {
"eGTYRSo81JefgasYLRHUFHUTnEC3" : {
"username" : "tester"
}
},
"-KotsNgF0ou5MIDn2l5K" : {
"eGTYRSo81JefgasYLRHUFHUTnEC3" : {
"username" : "tester"
}
},
"-Kotsv1Vv19dEF2q7XQu" : {
"eGTYRSo81JefgasYLRHUFHUTnEC3" : {
"username" : "tester"
}
},
"-KoyheS01YxWExSNxl_H" : {
"eGTYRSo81JefgasYLRHUFHUTnEC3" : {
"username" : "tester"
}
},
"-Koyjc_aBaF1kFE-8Bll" : {
"eGTYRSo81JefgasYLRHUFHUTnEC3" : {
"username" : "tester"
}
},
"-KpfLBjQdPiX2kSrl1yF" : {
"eGTYRSo81JefgasYLRHUFHUTnEC3" : {
"username" : "tester"
}
}
},
"chats" : {
"-KotqKI4zF9cS5XMR9WU" : {
"currentName" : "test",
"date" : 1499914130657
},
"-KotqvBoFFzOTY6Q1fO7" : {
"currentName" : "test",
"date" : 1499914285904
},
"-KotsNgF0ou5MIDn2l5K" : {
"currentName" : "test",
"date" : 1499914668844
},
"-Kotsv1Vv19dEF2q7XQu" : {
"currentName" : "test",
"date" : 1499914809570
},
"-KoyheS01YxWExSNxl_H" : {
"currentName" : "test",
"date" : 1499995744095
},
"-Koyjc_aBaF1kFE-8Bll" : {
"currentName" : "test",
"date" : 1499996260740
},
"-KpfLBjQdPiX2kSrl1yF" : {
"currentName" : "test3222",
"date" : 1500744567786
}
},
"user-chats" : {
"eGTYRSo81JefgasYLRHUFHUTnEC3" : {
"-KotqKI4zF9cS5XMR9WU" : {
"chatKey" : "-KotqKI4zF9cS5XMR9WU",
"currentName" : "test"
},
"-KotqvBoFFzOTY6Q1fO7" : {
"chatKey" : "-KotqvBoFFzOTY6Q1fO7",
"currentName" : "test"
},
"-KotsNgF0ou5MIDn2l5K" : {
"chatKey" : "-KotsNgF0ou5MIDn2l5K",
"currentName" : "test"
},
"-Kotsv1Vv19dEF2q7XQu" : {
"chatKey" : "-Kotsv1Vv19dEF2q7XQu",
"currentName" : "test"
},
"-KoyheS01YxWExSNxl_H" : {
"chatKey" : "-KoyheS01YxWExSNxl_H",
"currentName" : "test"
},
"-Koyjc_aBaF1kFE-8Bll" : {
"chatKey" : "-Koyjc_aBaF1kFE-8Bll",
"currentName" : "test"
},
"-KpfLBjQdPiX2kSrl1yF" : {
"chatKey" : "-KpfLBjQdPiX2kSrl1yF",
"currentName" : "test3222"
}
}
},
"user-friends" : {
"36HDn5XyxjMCcMluJJ9KPBOCDMm1" : {
"eGTYRSo81JefgasYLRHUFHUTnEC3" : {
"username" : "tester"
}
},
"eGTYRSo81JefgasYLRHUFHUTnEC3" : {
"36HDn5XyxjMCcMluJJ9KPBOCDMm1" : {
"username" : "tester2"
}
}
},
"user-invites" : {
"eGTYRSo81JefgasYLRHUFHUTnEC3" : {
"36HDn5XyxjMCcMluJJ9KPBOCDMm1" : {
"username" : "tester2"
}
}
},
"users" : {
"36HDn5XyxjMCcMluJJ9KPBOCDMm1" : {
"email" : "[email protected]",
"username" : "tester2"
},
"eGTYRSo81JefgasYLRHUFHUTnEC3" : {
"email" : "[email protected]",
"username" : "tester"
}
}
}