Parse nested JSON code in IOS

Question

I'm trying to parse the following JSON code in iOS. The JSON code consists of an array of games numbered 0 to x. I've been searching around but cant seem to find any examples which have JSON in this format.

{
"command":"show_my_games",
"0":{"gameid":"7","foruserid":"16","againstuserid":"0","casefor":"","caseagainst":"","status":"0","argumentid":"7","againstusername":null,"forusername":"Gem","argument":"argument 1"},
"1":{"gameid":"8","foruserid":"15","againstuserid":"16","casefor":"","caseagainst":"","status":"0","argumentid":"23","againstusername":"Gem","forusername":"Nick","argument":"argument 2"},
"2":{"gameid":"9","foruserid":"18","againstuserid":"16","casefor":"","caseagainst":"","status":"0","argumentid":"26","againstusername":"Gem","forusername":"Nick","argument":"argument 3"}
}

I've created a game object, and for each item in the JSON array, I want to create a new game object, and add this to the game array. I'm having trouble parsing the JSON, and i'd appreciate any help or advice.

The code i'm trying to use is

            NSMutableDictionary *json = [NSJSONSerialization JSONObjectWithData:responseData options:kNilOptions error:&err];

            for (NSMutableDictionary * gameItem in json) {
                Game *obj = [Game new];
                obj.GameID=[gameItem objectForKey:@"gameid"];
                obj.Argument=[gameItem objectForKey:@"argument"];
                obj.CaseFor=[gameItem objectForKey:@"casefor"];
                obj.CaseAgainst=[gameItem objectForKey:@"caseagainst"];
                obj.CaseForOwner=[gameItem objectForKey:@"forusername"];
                obj.CaseAgainstOwner=[gameItem objectForKey:@"againstusername"];
                obj.CaseForOwnerID=[gameItem objectForKey:@"foruserid"];
                obj.CaseAgainstOwnerID=[gameItem objectForKey:@"againstuserid"];
                //add to the players game array
                [myGameArray addObject:obj];

            }
            NSLog(@"array: %@", myGameArray);

When I try extracting data from the JSON array, I receive the following error. -[__NSCFString objectForKey:]: unrecognized selector sent to instance 0x1f06f4e0

Thanks in advance,

Nick

Peel the onion, one layer at a time. Your outermost structure is a dictionary, not an array. It's got dictionary elements named "1", "2", "3", and "command". — Hot Licks
– Hot Licks, Commented Apr 15, 2013 at 21:20
And the value of the "command" dictionary entry is "show_my_games", which is a string, hence the error. — Hot Licks
– Hot Licks, Commented Apr 15, 2013 at 21:21

Tommy · Accepted Answer · 2013-04-15 21:42:09Z

1

You need to change the type gameItem "NSMutableDictionary" to "id" and add the checking - if ([gameItem isKindOfClass: [NSDictionary Class]]) and in the case of this condition initialize "obj"

edited Apr 15, 2013 at 21:42

Tommy

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answered Apr 15, 2013 at 21:23

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Comments

Anupdas · Accepted Answer · 2013-04-15 21:16:43Z

The code is breaking as the object for the key command is not a dictionary.

You can modify the code like this.

    for (NSString *key in json){
        id object = json[key];
        if ([object isKindOfClass:[NSDictionary class]]) {
           Game *obj = [Game new];
           obj.GameID=[gameItem objectForKey:@"gameid"];
           obj.Argument=[gameItem objectForKey:@"argument"];
           obj.CaseFor=[gameItem objectForKey:@"casefor"];
           obj.CaseAgainst=[gameItem objectForKey:@"caseagainst"];
           obj.CaseForOwner=[gameItem objectForKey:@"forusername"];
           obj.CaseAgainstOwner=[gameItem objectForKey:@"againstusername"];
           obj.CaseForOwnerID=[gameItem objectForKey:@"foruserid"];
           obj.CaseAgainstOwnerID=[gameItem objectForKey:@"againstuserid"];
           //add to the players game array
          [myGameArray addObject:obj];
    }

I would suggest to make an initWithDictionary:(NSDictionary *)dictionary in your Game class for more cleaner code.

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