How to retrieve multiple data in one query Firebase - ios

Question

I'm new in firebase and nosql. I followed the guide for structuring data and here is what my data look like
{"Guardians" : {
"jojo-pti-gros" : {
"-KBT2ui6wlC6Fgk1c7Xa" : {
"creationDate" : "2016-02-26 15:50:56",
"level" : "2",
"light" : "2",
"type" : "Titan"
}
}
},
"Players" : {
"jojo-pti-gros" : {
"console" : "PS4",
"creationDate" : "2016-02-26 15:50:39",
"currentGuardian" : "-KBT2ui6wlC6Fgk1c7Xa",
"email" : "toto#gmail.com",
"gamertag" : "jojo-pti-gros",
"guardians" : {
"-KBT2ui6wlC6Fgk1c7Xa" : "true"
}
}
},
"Teams" : {
"-KBhfH9U3CxQPZiCs5ru" : {
"activity" : "Raid - Normal - Crota's end",
"creationDate" : "2016-02-29 16:37:14",
"language" : "Any language",
"leader" : "jojo-pti-gros",
"maxPlayers" : "6",
"mic" : "true",
"minimumLight" : "55",
"players" : {
"jojo-pti-gros" : "true"
},
"teamDescription" : "Chaud pour un raid"
}
}}
When I try to retrieve a team I would like to have a json like this.
"-KBhfH9U3CxQPZiCs5ru" = {
activity = "Raid - Normal - Crota's end",
creationDate = "2016-02-29 16:37:14",
language = "Any language",
leader = "jojo-pti-gros",
maxPlayers = 6,
mic = true,
minimumLight = 55,
players = {
"jojo-pti-gros" = {
"creationDate" = "2016-02-26 15:50:56",
"level" = "2",
"light" = "2",
"type" = "Titan"
}
},
teamDescription = "Chaud pour un raid"
}
But I have this json instead
"-KBhfH9U3CxQPZiCs5ru" = {
activity = "Raid - Normal - Crota's end",
creationDate = "2016-02-29 16:37:14",
language = "Any language",
leader = "jojo-pti-gros",
maxPlayers = 6,
mic = true,
minimumLight = 55,
players = {
"jojo-pti-gros" = true
},
teamDescription = "Chaud pour un raid"
}
My code right now
let fb = Firebase(url:myUrl)
fb.childByAppendingPath("/Teams").observeSingleEventOfType(.Value, withBlock: { teams in
var teamsArray: [Team] = []
if (teams.value is NSNull) {
print("no teams found")
} else {
print(teams.value)
for team in teams.value as! NSDictionary {
let newTeam = Team()
newTeam.dictionaryToTeam(team.value as! NSDictionary)
newTeam.id = String(team.key)
for player in newTeam.playerDictionary as NSDictionary {
GuardianAPI.sharedInstance.getGuardianByGamertagAndID(player.key as! String, id: player.value as! String, handler: {newGuardian in
newTeam.playerDictionary.setValue(newGuardian, forKey: player.key as! String)
})
}
teamsArray.append(newTeam)
}
handler(true)
}
})
I don't know how to make a query with juncture like SQL.
Can somebody know how to resolve this ?

Answer 1

There are a couple of directions to go with this.
One option is to read in your team node, separate out the player refs into perhaps an array and then iterate over the array to get each player ref and load each player with a separate Firebase call
A better option is to store a reference back to the team in each player's node
"Players" : {
"jojo-pti-gros" : {
team: "-KBhfH9U3CxQPZiCs5ru"
}
Observe the teams node to load in the team data then then query the players node for all players that have a child: team = "-KBhfH9U3CxQPZiCs5ru"
Firebase *playersRef = [myRootRef childByAppendingPath:#"Players"];
FQuery *query1 = [playersRef queryOrderedByChild:#"team"];
FQuery *query2 = [query1 queryEqualToValue:#"-KBhfH9U3CxQPZiCs5ru"];
[query2 observeEventType:FEventTypeValue withBlock:^(FDataSnapshot *snapshot) {
NSLog(#"key: %# %#", snapshot.key, snapshot.value);
}];
The result will be a snapshot filled with all of the players that belong to the team.