CODEWITHSUNDEEP
iphoneobjective-c
user973067
user973067

Reputation: 337

NSMutableArray:How to allow duplicate values

I'm reading a JSON code such as:

[{"question_id":"1",
  "trigger_value":"Yes",
  "question_text":"What is your first    name?",
  "question_type":"YN"},    
 {"question_id":"2",
  "trigger_value":"Yes",
  "question_text":"What is your second name?",
  "question_type":"YN"}
]

But once it's set into NSMutableArray, the duplicate values are deleted. I would like to allow them to check the question_type for each question.

  NSString *question_id;
  NSString *question_text;
  NSString *question_type;

   while (dicjson = (NSDictionary*)[enumerator nextObject]) {
      question_id = [dicjson objectForKey:@"question_id"];        
     question_type = [dicjson objectForKey:@"question_type"];

     [mutjson setObject:question_id    forKey:question_type];
}

Would you give me any idea of allowing duplicate values...? Thanks in advance.

Upvotes: 1

Views: 541

Answers (3)

john
john

Reputation: 3103

You are confusing an array for a dictionary. An array can hold duplicate values. A dictionary cannot hold duplicate keys.

The JSON response is an array of dictionaries. The way you've written your code, specifically [mutjson setObject:question_id forKey:question_type]; seems to suggest that you are simply using a dictionary.

If you would like to check the question type for each question, try instead:

NSString *question_type;

for (NSMutableDictionary *dict in dicjson) {
    // I would suggest renaming dicjson to something more descriptive, like results
    question_type = [dict objectForKey: @"question_type"];

    // Do what you would like now that you know the type
}

Upvotes: 1

JonasG
JonasG

Reputation: 9324

You cannot setObject:forKey: in NSMutableArray. You have to use addObject:. Its also much easier to create the array like this:

NSArray *values = [jsonDict allValues];

Upvotes: 1

Lefteris
Lefteris

Reputation: 14667

mutjson looks like a mutable dictionary and not a mutable Array.

So yes, in a dictionary object if you are setting the same key, it will overwrite the previous value. If you need to store dictionary object, create a mutable array and add each object inside that array as a dintionary object...

NSMutableArray *results = [[NSMutableArray alloc] init];

while (dicjson = (NSDictionary*)[enumerator nextObject]) {
     question_id = [dicjson objectForKey:@"question_id"];        
     question_type = [dicjson objectForKey:@"question_type"];
     [result addObject:[NSDictionary dictionaryWithObject:question_id forKey:question_type]];
}

Upvotes: 3

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