Using NSPredicate with nested arrays ios

Question

I have an array like this

NSMutableArray *level1;
NSMutableArray *level2;
NSMutableArray *level3;

self.questionSections=[[NSArray alloc] initWithObjects:@"Level 1",@"Level 2",@"Level 3", nil];

level1=[[NSMutableArray alloc] init];
level2=[[NSMutableArray alloc] init];
level3=[[NSMutableArray alloc] init];

[level1 addObject:[[NSDictionary alloc] initWithObjectsAndKeys:
                   @"What is the opposite of up?",@"name",
                   @"101q.png",@"questionpicture",
                   nil]];

[level1 addObject:[[NSDictionary alloc] initWithObjectsAndKeys:
                   @"What is the opposite of front?",@"name",
                   @"102q.png",@"questionpicture",
                   nil]];


[level2 addObject:[[NSDictionary alloc] initWithObjectsAndKeys:
                   @"Name a common pet?",@"name",
                   @"201q.png",@"questionpicture",
                   nil]];


[level2 addObject:[[NSDictionary alloc] initWithObjectsAndKeys:
                   @"Name a common bird?",@"name",
                   @"202q.png",@"questionpicture",
                   nil]];


[level3 addObject:[[NSDictionary alloc] initWithObjectsAndKeys:
                   @"List 3 rooms in your house?",@"name",
                   @"301q.png",@"questionpicture",
                   nil]];

self.questionData=[[NSArray alloc] initWithObjects:level1,level2,level3, nil];

And I want to search it. I am trying this but getting nowhere

NSPredicate *resultPredicate=[NSPredicate predicateWithFormat:@"name CONTAINS 'the'"];

NSLog(@"%@",resultPredicate);
NSLog(@"%@",self.questionData);

self.searchResults=[self.questionData  filteredArrayUsingPredicate:resultPredicate];

NSLog(@"%@",self.searchResults);

resultPredicate looks fine "name CONTAINS 'the'"

self.questionData looks fine

But self.searchResults is just ( )

Any ideas to help would be great. Thanks.

stackoverflow.com/questions/1434291/…

user523234
– user523234

2013-07-18 11:51:19 +00:00
Commented Jul 18, 2013 at 11:51 — user523234
– user523234, Commented Jul 18, 2013 at 11:51

Puneet Sharma · Accepted Answer · 2013-07-18 12:47:35Z

5

I used Subquery to solve this

 NSArray *questionData=[[NSArray alloc] initWithObjects:level1,level2,level3, nil];

 NSPredicate *resultPredicate=[NSPredicate predicateWithFormat:@"SUBQUERY(name, $content, $content CONTAINS %@).@count > 0", @"the"];

 NSArray *searchResults=[questionData  filteredArrayUsingPredicate:resultPredicate];

 NSLog(@"%@",searchResults);

Result::

(
    (
            {
        name = "What is the opposite of up?";
        questionpicture = "101q.png";
    },
            {
        name = "What is the opposite of front?";
        questionpicture = "102q.png";
    }
)

)

answered Jul 18, 2013 at 12:47

Puneet Sharma

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Comments

Balu · Accepted Answer · 2013-07-18 11:59:34Z

here problem with array.

(
        (
                {
            name = "What is the opposite of up?";
            questionpicture = "101q.png";
        },
                {
            name = "What is the opposite of front?";
            questionpicture = "102q.png";
        }
    ),
        (
                {
            name = "Name a common pet?";
            questionpicture = "201q.png";
        },
                {
            name = "Name a common bird?";
            questionpicture = "202q.png";
        }
    ),
        (
                {
            name = "List 3 rooms in your house?";
            questionpicture = "301q.png";
        }
    )
)

for working your above predicate then array must be like this,

(
        {
        name = "What is the opposite of up?";
        questionpicture = "101q.png";
    },
        {
        name = "What is the opposite of front?";
        questionpicture = "102q.png";
    },
        {
        name = "Name a common pet?";
        questionpicture = "201q.png";
    },
        {
        name = "Name a common bird?";
        questionpicture = "202q.png";
    },
        {
        name = "List 3 rooms in your house?";
        questionpicture = "301q.png";
    }
)

EDIT:- try like this,

 NSArray *questionData=[[NSArray alloc] initWithObjects:level1,level2,level3, nil];

NSPredicate *resultPredicate=[NSPredicate predicateWithFormat:@"name CONTAINS 'the'"];


NSMutableArray *resultarray= [[NSMutableArray alloc]init];
for(int i=0;i<[questionData count];i++){
    NSArray* searchResults=[[questionData objectAtIndex:i]  filteredArrayUsingPredicate:resultPredicate];
    if([searchResults count]>0)
        [resultarray addObject:searchResults];
}
NSLog(@"%@",resultarray);
O/P:-
 (
        (
                {
            name = "What is the opposite of up?";
            questionpicture = "101q.png";
        },
                {
            name = "What is the opposite of front?";
            questionpicture = "102q.png";
        }
    )
)

The problem can be solved using subquery , there is no need to use for loop or change your array structure.

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