Sort NSArray with multiple NSDictonaries in it

Question

I need to sort the given "document" array with "lastname". Here is the sample json

document [
{
    id:"100"
    person :{
       name : {
        firstname : "xyz",
        lastname  : "oops"
       },
       photourl: "photo-url"
    }
},
{
    id:"200"
    person :{
       name : {
        firstname : "xyz",
        lastname  : "oops"
       },
       photourl: "photo-url"
    }
}]

it has an dict "name" inside one more dict "person" and we need to sort with lastname first n then with lastname

http://stackoverflow.com/a/9509181/1059705 check this out.. might help you — Bala, Jul 10 '13 at 12:19

score 1 · Accepted Answer · answered Jul 10 '13 at 12:37

1

NSSortDescriptor *lastNameDescriptor = [[NSSortDescriptor alloc] initWithKey:@"lastname " ascending:YES] ;
NSArray *sortedArray = [NSArray arrayWithObject:lastNameDescriptor];
sortedArray = [myArray sortedArrayUsingDescriptors:sortDescriptors];

for more clear description and code check this link, its very easy and perfect, Cheers :)

answered Jul 10 '13 at 12:37

iAhmed

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1

This does not compile (because sortDescriptors is nowhere defined) and is *not correct*, because "lastname" is a key inside the "person" dictionay. – Martin R Jul 10 '13 at 12:44
1

***I*** don't want anything. I just noticed that the answer is wrong. – Martin R Jul 10 '13 at 13:26
its just a hint brother. use link below it will surely help you. i have also done by same link. – iAhmed Jul 10 '13 at 14:44

grilchgristle · Answer 2 · 2015-07-23T23:05:19.947

So assuming you put your JSON into an array called "people":

NSArray *people = myArrayFromJSON;

NSSortDescriptor *sortDescriptor = [NSSortDescriptor sortDescriptorWithKey:@"person" ascending:YES comparator:^NSComparisonResult(id obj1, id obj2) {
    NSString *lastName1 = [obj1 valueForKey:@"lastname"];
    NSString *lastname2 = [obj2 valueForKey:@"lastname"];

    return [lastName1 compare:lastname2];
}];

NSArray *sortedArray = [people sortedArrayUsingDescriptors:@[sortDescriptor]];

That'll do it.

score 0 · Answer 3 · answered Jul 10 '13 at 15:44

Use the below given logic

for (NSMutableDictionary *document in documents) {
    NSString *lastName = [[document valueForKey:@"person"] valueForKey:@"lastname"];
    [documents setObject:lastName forKey:@"lastnameDescriptor"];
}

NSSortDescriptor *descriptor = [[NSSortDescriptor alloc] initWithKey:@"lastnameDescriptor" ascending:YES];
NSMutableArray *sortedNames = [documents sortedArrayUsingDescriptors:[NSArray arrayWithObject:descriptor]];

for (NSMutableDictionary *document in sortedNames) {
    [document removeObjectForKey:@"lastnameDescriptor"];
}

score 0 · Answer 4 · answered Jul 11 '13 at 05:15

The other answers are close but either needlessly complicated or a little off.

NSSortDescriptor *descriptor = [NSSortDescriptor sortDescriptorWithKey:@"person.lastName" ascending:YES];
sortedArray = [document sortedArrayUSingDescriptors:@[descriptor]];

(The selector says "key," but if you read the docs, it's actually a keypath, so this will work as expected.)

score 0 · Answer 5 · answered Jul 11 '13 at 05:40

Lots of almost right answers but none that consider that 'name' is itself a nested dictionary in your document. So I think what you want is:

NSSortDescriptor *lastNameDescriptor = [NSSortDescriptor sortDescriptorWithkey:@"person.name.lastname" ascending:YES];
NSSortDescriptor *firstNameDescriptor = [NSSorteDescriptor sortDescriptorWithKey:@"person.name.firstname" ascending:YES];
NSArray *sortedArray = [document sortedArrayUsingDescriptors:@[lastNameDescriptor, firstNameDescriptor]];

Thanks Erik H. this code worked. but how come string "person.name.lastname" is compared with dictionary keypath value — Ghouse, Jul 12 '13 at 11:32

Sort NSArray with multiple NSDictonaries in it

5 Answers5