iOS NSMutableArray of NSMutableDictionaries. Updating a value

[estupefactika]

Hi, I have a NSMutableArray of NSMutableDictionaries. How Could I update the value for a key of my array?
My array is something like this:

(
        {
        name = "foo";
        surname = "woo";
    },
 {
        name = "foo2";
        surname = "woo2";
    }
)

I would like to update a value for key "name" for example:

for (int i=0; i<[feedArray count];i++) {
		NSMutableDictionary *itemAtIndex = (NSMutableDictionary *)[feedArray objectAtIndex:i];
[itemAtIndex setValue:@"David" forKey:@"name"];
		
		[feedArray insertObject:itemAtIndex atIndex:i];

}

But Im receiving the next error:
Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: '*** -[NSCFDictionary setObject:forKey:]: mutating method sent to immutable object'

It is any wrong? How Can I updated it? Thanks

 

[PhoneyDeveloper]

The runtime exception is telling you that you're trying to change a NSDictionary. IOW, what you think is a NSMutableDictionary is really a NSDictionary.

Look at the code for where you create the array of dictionaries.

Also, this line is wrong

	[feedArray insertObject:itemAtIndex atIndex:i];

You should retrieve the dictionary at the desired index and update it. You don't have to insert it again.

 

[estupefactika]

The runtime exception is telling you that you're trying to change a NSDictionary. IOW, what you think is a NSMutableDictionary is really a NSDictionary.

Look at the code for where you create the array of dictionaries.

Also, this line is wrong

	[feedArray insertObject:itemAtIndex atIndex:i];

You should retrieve the dictionary at the desired index and update it. You don't have to insert it again.

Ok. Thanks. Im creating my array in this way:

// save values to an item, then store that item into the array...
item = [[NSMutableDictionary alloc] init];
[item setObject:name forKey:@"name"];
[item setObject:surname forKey:@"surname"];
[feedArray addObject:[item copy]];
[item release];

Where feedArray is a NsMutableArray, item is a NsMutableDictionary and name and surname are NsMutableString. Is there any wrong there?

 

[PhoneyDeveloper]

Yes, copy returns an immutable copy. There's no reason to make a copy in this code that I can see. Just add item to the array.

[feedArray addObject:item];

If you must make a copy use

[item mutableCopy];

 

[estupefactika]

Yes. It works. Thanks