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iOS

Posted by Dan Boyle
Dan Boyle
2,978 Points

Ribbit - Querying Parse for Users and Storing Them In a NSArray

Quick question that I don't really understand. 

 PFQuery *query = [PFUser query];
    [query orderByAscending:@"username"];
    [query findObjectsInBackgroundWithBlock:^(NSArray *objects, NSError *error) {
        if (error) {
            NSLog(@"Error: %@ %@", error, [error userInfo]);
        }
        else {
            self.allUsers = objects;
            [self.tableView reloadData];
        }
    }];

Why is self.allUsers set to objects? What is objects?

Why isn't it set to the query variable?

1 Answer

Stone Preston
Stone Preston
42,016 Points
Stone Preston
Stone Preston
42,016 Points

objects is what the query returns. so the query runs its findObjectsinBackground method, and that method returns objects. The objects variable is an array that contains whatever your query found.

if you tried setting self.allUsers to the query variable, it would not work since your query variable is of type PFQuery, and your allUsers is of type NSArray.

Dan Boyle
Dan Boyle
2,978 Points

Cool. Thanks for explaining that!