How to extract data from a NSArray fill with NSDictionary? - iphone

Question

i try to make a kind of "sql distinct" request with core data,
so i set up my NSFetchrequest like this
NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init];
[fetchRequest setEntity:[NSEntityDescription entityForName:#"my_table" inManagedObjectContext:managedObjectContext]];
[fetchRequest setResultType:NSDictionaryResultType];
[fetchRequest setReturnsDistinctResults:YES];
[fetchRequest setPropertiesToFetch:[NSArray arrayWithObjects:#"first_property",#"second_property",nil]];
// Execute the fetch
NSError *error;
table_dom = [[NSArray alloc] init];
table_dom = [managedObjectContext executeFetchRequest:fetchRequest error:&error];
[fetchRequest release];
this looks ok for me but I think I retrieve an NSArray fill with NSDictionary, is that rigth ?
So my question is how can I extract data from table_dom for a tableview, I try many things but no ones work ?
It has to be:
cell.textLabel.text = //"first property" and
cell.detailTextLabel.text = //"second_property"
Or perhaps to make it simple, can I retrieve objects with setReturnsDistinctResults instead of NSDictionary ?
Thanks

Answer 1

Why not you can access in forms of objects so for this
remove
[fetchRequest setResultType:NSDictionaryResultType];
and
[fetchRequest setPropertiesToFetch:[NSArray arrayWithObjects:#"first_property",#"second_property",nil]];
then Now
table_dom = [managedObjectContext executeFetchRequest:fetchRequest error:&error];
table_dom having objects of your entity so where you use this array
extract objects and access both property first_property and second_property
by simply using . operator.

Answer 2

You are correct that you will get a NSArray filled with NSDictionary. First I would like to point out you have a memory leak in your code. table_dom = [[NSArray alloc] init]; is not necessary since executeFetchRequest:error: will return an NSArray. So just remove that line.
After you have your array you can do something like this:
NSDictionary *dict = [table_dom objectAtIndex:indexPath.row];
cell.textLabel.text = [dict objectForKey:#"first_property"];
cell.detailTextLabel.text = [dict objectForKey:#"second_property"];