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POSplit an NSArray in smaller key value coded arrays using a common key-value pair between objects
 

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  1. POSplit an NSArray in smaller key value coded arrays using a common key-value pair between objects
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    <p><br> I'm trying to find a good solution to split an array of dictionaries in a smaller dictionaries keyed by a common value between them. <br> Here is an example i JSON, I start from this:</p> <pre><code>{ "field": [ { "id": 6, "name": "Andrea" }, { "id": 67, "name": "Francesco" }, { "id": 8, "name": "Maria" }, { "id": 6, "name": "Paolo" }, { "id": 67, "name": "Sara" } ] } </code></pre> <p>I'd like to get a result like:<br></p> <pre><code>{ "field": [ { "6": [ { "name": "Andrea", "id": 6 }, { "name": "Paolo", "id": 6 } ], "67": [ { "name": "Sara", "id": 67 }, { "name": "Francesco", "id": 67 } ], "8": [ { "name": "Maria", "id": 8 } ] } ] } </code></pre> <p>I managed using this code, it works, but I'm wondering if exist something more correct and fast:<br></p> <pre><code> NSArray * array = ...; NSSortDescriptor *sorter1=[[NSSortDescriptor alloc]initWithKey:@"id" ascending:YES selector:@selector(compare:)]; NSSortDescriptor *sorter2=[[NSSortDescriptor alloc]initWithKey:@"name" ascending:YES selector:@selector(caseInsensitiveCompare:)]; NSArray *sortDescriptors=[NSArray arrayWithObjects:sorter1,sorter2,nil]; array = [array sortedArrayUsingDescriptors:sortDescriptors]; //////////////////////////////SPLITTER NSMutableArray * subcategorySplittedArray = [[NSMutableArray alloc]initWithCapacity:30]; NSNumber * lastID=[[array objectAtIndex:0]objectForKey:@"id"]; NSMutableArray * shopArray = [[NSMutableArray alloc]initWithCapacity:100]; NSMutableDictionary * catDict = nil; for (NSDictionary * dict in array) { NSNumber * catID = [dict objectForKey:@"id"]; if ([lastID isEqualToNumber:catID]) { [shopArray addObject:dict]; } else { catDict = [[NSMutableDictionary alloc]init ]; [catDict setObject:[shopArray copy] forKey:lastID]; [subcategorySplittedArray addObject:catDict]; [shopArray removeAllObjects]; [shopArray addObject:dict]; lastID = catID; } } catDict = [[NSMutableDictionary alloc]init ]; [catDict setObject:[shopArray copy] forKey:lastID]; [subcategorySplittedArray addObject:catDict]; //////////////////////////////////// return subcategorySplittedArray; } </code></pre>
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