Prevent duplicates when saving to Plist - iphone

Question

I managed to successfully save data to a plist (in this case, a bookmark list), but I can't seem to figure out how to prevent the user from saving same data twice. I'm using "moveRowAtIndexPath" to re-order the bookmarks. When there is a duplicate on the list, it causes a crash during sorting. Here is my code:
- (IBAction)addBookmarkButtonClicked:(id)sender {
NSArray *paths = NSSearchPathForDirectoriesInDomains (NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsPath = [paths objectAtIndex:0];
NSString *plistPath = [documentsPath stringByAppendingPathComponent:#"Bookmarks.plist"];
NSMutableArray *bookmarksArray = [NSMutableArray arrayWithContentsOfFile:plistPath];
if (nil == bookmarksArray) {
bookmarksArray = [[NSMutableArray alloc] initWithCapacity:0];
}
NSMutableDictionary *array = [[NSMutableDictionary alloc]init];
[array setObject:gameName.text.self forKey:#"gameName"];
[array setObject:gameRating.text.self forKey:#"gameRating"];
[bookmarksArray addObject:array];
[bookmarksArray writeToFile:plistPath atomically: TRUE];
}

Answer 1

Before you add the item to the BookmarksArray you should check if it already exists.
You can do that by looping thorough all the items in the BookmarksArray and compare each item's keys to the new value you're trying to add. Example:
BOOL itemExist, sameName, sameRating;
itemExist=NO;
sameName=NO;
sameRating=NO;
For (int i=0, i<[bookmarksArray count], i++) {
If ([gameName.text isEqualToString:[[bookmarksArray itemAtIndex:i] itemForKey:gameName]]) {
sameName=YES;
}
If ([gameRating.text isEqualToString:[[bookmarksArray itemAtIndex:i] itemForKey:gameRating]]) {
sameRating=YES;
}
if (sameName && sameRating) itemExist=YES;
sameName=NO;
sameRating=NO;
}
if (!itemExist) {
//item can be added
}