Sort NSArray with multiple NSDictonaries in it [duplicate] - iphone

Question

This question already has answers here:
Sorting NSArray of dictionaries by value of a key in the dictionaries
(11 answers)
Closed 9 years ago.
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

Answer 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 :)

Answer 2

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"];
}

Answer 3

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.)

Answer 4

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]];

Answer 5

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.