Create array of dictionary with different keys? - objective-c

Question

I have following array,I have one array with multiple dictionaries,I need to get that dictionaries for same prod_type and create another array with unique key
nsarray
{
{
prod_type=abc;
fund=100;
};
{
prod_type=abc;
fund=100;
};
{
prod_type=abc;
fund=100;
};
{
prod_type=pqr;
fund=100;
};
{
prod_type=pqr;
fund=100;
};
{
prod_type=xyz;
fund=100;
};
{
prod_type=xyz;
fund=100;
};
I need following array format from above array
nsarray=
{
abc=
{
{
prod_type=abc;
fund=100;
};
{
prod_type=abc;
fund=100;
};
{
prod_type=abc;
fund=100;
};
}
pqr=
{
{
prod_type=pqr;
fund=100;
};
{
prod_type=pqr;
fund=100;
};
}
xyz=
{
{
prod_type=xyz;
fund=100;
};
{
prod_type=xyz;
fund=100;
};
}
}

Answer 1

Use NSPredicate to get desirable result.
NSString *selectedCategory=#"abc";
//filter array by category using predicate
NSPredicate *predicate = [NSPredicate predicateWithFormat:#"prod_type == %#", selectedCategory];
NSArray *filteredArray = [yourAry filteredArrayUsingPredicate:predicate];
NSDictionary *abcDic = [NSDictionary dictionaryWithObject:filteredArray forKey:#"abc"];
[yourNewAry addObject:abcDic];
You can repeat it for other
Here a nice explanation of it predicates

Answer 2

Use this code if you want a fully automated solution (without having to re-specify each prod_type):
NSMutableArray *keys = [originalArray mutableArrayValueForKey:#"prod_type"];
NSOrderedSet *orderedSet = [NSOrderedSet orderedSetWithArray:keys];
NSArray *uniqueKeys = orderedSet.array;
NSMutableArray *resultArray = [[NSMutableArray alloc] init];
for(NSString *key in uniqueKeys){
NSPredicate *keyPredicate = [NSPredicate predicateWithFormat:#"prod_type = %#",key];
NSDictionary *keyDictionary = [NSDictionary dictionaryWithObject:[originalArray filteredArrayUsingPredicate:keyPredicate] forKey:key];
[resultArray addObject:keyDictionary];
}
NSLog(#"%#",resultArray);

Answer 3

try like this,
NSMutableDictionary *resultdict = [[NSMutableDictionary alloc]init];
NSMutableArray *keysArray =[array mutableArrayValueForKey:#"prod_type"];//here you'l get all the prod_type values in an array
for(int i=0;i<[keysArray count];i++){
NSPredicate *resultPredicate=[NSPredicate predicateWithFormat:#"prod_type CONTAINS %#",[keysArray objectAtIndex:i]];
NSArray* searchResults=[array filteredArrayUsingPredicate:resultPredicate];
[resultdict setObject:searchResults forKey:[keysArray objectAtIndex:i]];
}
NSLog(#"%#",resultdict);
EX:-
NSMutableArray *array =[[NSMutableArray alloc]init];
NSMutableDictionary *dict = [[NSMutableDictionary alloc]initWithObjects:#[#"abc",#"100"] forKeys:#[#"name",#"value"]];
NSMutableDictionary *dict1 = [[NSMutableDictionary alloc]initWithObjects:#[#"pqr",#"100"] forKeys:#[#"name",#"value"]];
NSMutableDictionary *dict2 = [[NSMutableDictionary alloc]initWithObjects:#[#"pqr",#"100"] forKeys:#[#"name",#"value"]];
[array addObject:dict];
[array addObject:dict1];
[array addObject:dict2];
NSLog(#"%#",array);
(
{
name = abc;
value = 100;
},
{
name = pqr;
value = 100;
},
{
name = pqr;
value = 100;
}
)
NSMutableDictionary *resultdict = [[NSMutableDictionary alloc]init];
NSMutableArray *keysArray =[array mutableArrayValueForKey:#"name"];
for(int i=0;i<[keysArray count];i++){
NSPredicate *resultPredicate=[NSPredicate predicateWithFormat:#"name CONTAINS %#",[keysArray objectAtIndex:i]];
NSArray* searchResults=[array filteredArrayUsingPredicate:resultPredicate];
[resultdict setObject:searchResults forKey:[keysArray objectAtIndex:i]];
}
NSLog(#"%#",resultdict);
{
abc = (
{
name = abc;
value = 100;
}
);
pqr = (
{
name = pqr;
value = 100;
},
{
name = pqr;
value = 100;
}
);
}