Objective C how to read from nested JSON

Question

I have to read some values from nested JSON and I can't read them properly. JSON looks like this:

 "addons" : [
      {
        "group_title" : "Veggie Toppings",
        "group_type" : "T",
        "item_id" : "29",
        "addon" : [
          {
            "id" : "31",
            "item_title" : "Ham"
          },
          {
            "id" : "32",
            "item_title" : "Mushrooms"
          }
        ]
      },
      {
        "group_title" : "Meat Toppings",
        "group_type" : "T",
        "item_id" : "33",
        "addon" : [
          {
            "id" : "30",
            "item_title" : "Sausage"
          }
        ]
      }

And my code is:

-(void)setData:(NSMutableDictionary *)menuItems{
    self.menuItem = menuItems;
    // [GSDVActivityIndicator stopWithID:kNotificationHello];
    self.dictionaryOrder = [NSMutableDictionary dictionaryWithDictionary:[self.menuItem valueForKey:@"order"]];
    self.arrayPrices = [NSArray arrayWithArray:[self.menuItem valueForKey:@"price"]];
    self.arrayAddons = [NSArray arrayWithArray:[self.menuItem valueForKey:@"addons"]];
    self.myAddons = [NSArray arrayWithArray:[self.arrayAddons valueForKey:@"addon"]];

    [self setViewGUIData];

    NSLog ( @"addons= %@", [self.arrayAddons valueForKey:@"Group_title]);

    NSLog ( @"addon = %@", [self.myAddons valueForKey:@"item_title"]);

}

And the result is:

2014-03-24 19:48:04.446 [3698:70b] addons= (
    "Veggie Toppings",
    "Meat Toppings"
)
2014-03-24 19:48:04.447 [3698:70b] addon = (
        (
        Ham,
        Mushrooms
    ),
        (
        "Sausage"
    )
)

SO problem is in the second part where the items "ham, mushrooms and sausage" are in bad format and i can't read them and put them in label. Obviously this line is bad :

self.myAddons = [NSArray arrayWithArray:[self.arrayAddons valueForKey:@"addon"]];

But i don't know how to correct it.

Thanks.

In second nslog you have "itemtitle" but key in dictionary is : "item_title", how it works? — Robert
– Robert, Commented Mar 24, 2014 at 19:23
the key names were in my native language so i edited them for the post, but that is not the problem, it works in Xcode, i just misspelled in this post. — user3194296
– user3194296, Commented Mar 24, 2014 at 19:33

dokkaebi · Accepted Answer · 2014-03-24 19:32:57Z

1

What you're doing is working correctly. The values for "addon" are [{"id" : "31", "item_title" : "Ham"}, {"id" : "32", "item_title" : "Mushrooms"}] and {"id" : "30","item_title" : "Sausage"}, so valueForKey is giving you an array containing those two values.

You don't say exactly what format you want, but I'm guessing you want a flat list. You can just make an array, iterate over the groups, and put in each addon:

NSMutableArray* addons = [NSMutableArray array];
NSArray* groups = [self.menuItem valueForKey:@"addons"];
[groups enumerateObjectsUsingBlock:^(NSDictionary* group, NSUInteger idx, BOOL *stop) {
    NSArray* addonsInThisGroup = group[@"addon"];
    [addonsInThisGroup enumerateObjectsUsingBlock:^(NSDictionary* addon, NSUInteger idx, BOOL *stop) {
        [addons addObject:addon];
    }];
}];

This would result in:

[
    {"id" : "31", "item_title" : "Ham"}, 
    {"id" : "32", "item_title" : "Mushrooms"}, 
    {"id" : "30","item_title" : "Sausage"}
]

answered Mar 24, 2014 at 19:32

dokkaebi

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2 Comments

user3194296 Over a year ago

Thank you very much:D now i get addon = ( Ham, Mushrooms, "Ameci Sausage" ) Do you know why are Ham and mushrooms without quotes?

dokkaebi Over a year ago

When displaying strings in the console, it will use quotes only if it needs to. Ameci Sausage gets them because it has a space.

prelite · Accepted Answer · 2014-03-24 19:59:55Z

1

Add JSONKit to your project files and turn JSON strings into dictionay objects. Let's pretend your json datas are stored in a varaible called "responseString". You just have to do this:

        NSArray *addons = [[NSArray alloc] init];
        addons = [[responseString objectFromJSONString] objectForKey: @"addons"];

Now in your array addons you'll have dictionary objects with keys "group_title", "group_type", "item_id" and "addon". Inside the object with the key "addon" you'll have an array of two dictionary objects with the keys "id" and "item_title".

answered Mar 24, 2014 at 19:59

prelite

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