MagicalRecord - how to clear nsfetchedresultscontroller cache and change predicate

Question

The following works one time:

self.fetchedResultsController = [Cat MR_fetchAllSortedBy:@"age" ascending:YES withPredicate:predicate groupBy:@"age" delegate:self inContext:[NSManagedObjectContext MR_defaultContext]];

But setting a new predicate and making this call again does not refresh the data. How can I clear the cache and force the fetchedResultsController to fetch new data?

Answer 1

You have to change the fetchedResultsController's predicate or sortDesctriptors property.

NSSortDescriptor *sortDescriptor = [NSSortDescriptor sortDescriptorWithKey:@"startDate" ascending:YES];
[[fetchedResultsController fetchRequest] setSortDescriptors:@[sortDescriptor]];

or

[[fetchedResultsController fetchRequest] setPredicate:predicate];

..and you have fetch again

if (![[self fetchedResultsController] performFetch:&error]) {
    // Handle you error here
}

..and refresh your tableView

[self.tableView reloadData];