Differentiating UITableViewCells Using Core Data - objective-c

Question

I have two entities, Note and Tag, that have a many-to-many relationship.
I want to be able to tap on a Note and have a UITableView that is populated with all the Tags that exist, and all the Tags that have a relationship with the Note that was tapped have a UITableViewCellAccessoryCheckmark on the right.
What I've tried doing is fetching two arrays, the array with all the tags and the array with the related tags. Then I did something like this:
for (int i = 0; i < [self.tagArray count]; i++) {
Tag *new = [self.tagArray objectAtIndex:i];
if ([self.all containsObject: new])
{
new.isIn = TRUE;
}
else {
new.isIn = FALSE;
}
}
isIn is a property of Tag, initialized like this:
In Tag.h:
#property BOOL isIn;
In Tag.m:
#synthesize isIn;
I have a feeling this is the wrong approach though. Can anyone think of a better solution?

Answer 1

As per my comment, if you are displaying all of the tags anyway, you don't need to precheck to see if the tag should have a checkmark or not.
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
// not going to go into basic cell generation logic here
Tag *currentTag = [self.tagArray objectAtIndex:indexPath.row];
if([self.all containsObject: currentTag])
{
// checkmark
}
else
{
// no checkmark
}
return cell;
}