I have a simple CoreData application which stores information, names, dates, etc... and all is working. There is a search method, which uses the setFetchPredicate on an NSArrayController and the results appear in a table - this is working.
Looking at adding some addition code at the end of this method, so just before the method ends, I added a simple line to get the count of the NSArrayController.
[searchArrayController setFetchPredicate: searchPredicate];
[searchArrayController rearrangeObjects];
NSlog(@"Count = %lu", (unassigned long)[[searchArrayController arrangedObjects] count]);
Results: Count = 1200
(1200 is the number of objects in the database.)
The table displays correctly, i.e. show the correct number of data objects, however the NSLog count is the entire database.
I placed a second NSLog in the beginning of the method. If I run the search a second time, the second NSLog shows the correct number of objects.
Beginning method:
NSlog(@"A-Count = %lu", (unassigned long)[[searchArrayController arrangedObjects] count]);
...
[searchArrayController setFetchPredicate: searchPredicate];
[searchArrayController rearrangeObjects];
NSlog(@"B-Count = %lu", (unassigned long)[[searchArrayController arrangedObjects] count]);
end of method
Results:
First Run:
A-Count = 1200
B-Count = 1200
NSTable displays correct number of objects
Second Run:
A-Count = 4 (This is correct for the search parameters)
B-Count = 4
It appears the first time though the method the NSArrayController has not yet been filtered based on the predicate when the B-Count NSLog is called. But this is at the end of the method, the NSArrayController should be filtered at this point.
I've got to be missing something simple here - any help would be appreciated.
Thank you
rearrangeObjects uses filterPredicate. fetch uses fetchPredicate but fetch is deferred until the next iteration of the runloop.