Some users not showing up in search parse iOS - ios

Question

I have a parse app for iOS where it is sometimes necessary to search all the users. For some reason though, the users exist in the database but other users cannot see them in a search. I have seen no correlation between users or reason for this the only thing I'm thinking is maybe parse is not searching ALL users? Here is the code for the search
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
self.parseClassName = #"_User";
self.textKey = #"name";
// Whether the built-in pull-to-refresh is enabled
self.pullToRefreshEnabled = YES;
// Whether the built-in pagination is enabled
self.paginationEnabled = NO;
}
return self;
}
- (PFQuery *)queryForTable
{
PFQuery *query = [PFQuery queryWithClassName:#"_User"];
[query whereKey:#"isTeacher" equalTo:#"True"];
[query whereKey:#"schoolName" equalTo:[[PFUser currentUser] objectForKey:#"schoolName"]];
return query;
}
I'm assuming if there was a problem it would be in the above, but the rest of the code is here if need be:
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath object:(PFObject *)object {
static NSString *CellIdentifier = #"Cell";
PFTableViewCell *cell = (PFTableViewCell *)[tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[PFTableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
cell.textLabel.text = [object objectForKey:#"name"];
cell.detailTextLabel.text = [object objectForKey:#"username"];
}
// Configure the cell
if (tableView == self.tableView) {
cell.textLabel.text = [object objectForKey:#"name"];
if (cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:#"Cell"];
}
}
if (tableView == self.searchDisplayController.searchResultsTableView) {
PFObject* object = self.searchResults[indexPath.row];
//UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:#"Cell"];
cell.textLabel.text = [object objectForKey:#"name"];
if (cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:#"Cell"];
}
}
return cell;
}
-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
UITableViewCell *cell = [tableView cellForRowAtIndexPath:indexPath];
NSString *teacherUsername = cell.textLabel.text
;
//NSLog(teacherUsername);
[[NSUserDefaults standardUserDefaults] setObject:teacherUsername forKey:#"teacherUsername"];
[self performSegueWithIdentifier:#"next" sender:self];
}
-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
if (tableView == self.tableView) {
return self.objects.count;
} else {
return self.searchResults.count;
}
}
-(void)filterResults:(NSString *)searchTerm {
[self.searchResults removeAllObjects];
PFQuery *query = [PFQuery queryWithClassName:#"_User"];
[query whereKey:#"isTeacher" equalTo:#"True"];
[query findObjectsInBackgroundWithBlock:^(NSArray *objects, NSError *error) {
NSArray *results = [NSArray arrayWithArray:objects];
NSLog(#"%#", results);
NSLog(#"%lu", (unsigned long)results.count);
NSLog(#"results^");
[self.searchResults addObjectsFromArray:results];
NSPredicate *searchPredicate =
[NSPredicate predicateWithFormat:#"SELF.name contains[c] %#",searchTerm];
_searchResults = [NSMutableArray arrayWithArray:[results filteredArrayUsingPredicate:searchPredicate]];
[self.searchDisplayController.searchResultsTableView reloadData];
NSLog(#"%#", _searchResults);
NSLog(#"%lu", (unsigned long)_searchResults.count);
NSLog(#"search results^");
}];
}
-(BOOL)searchDisplayController:(UISearchDisplayController *)controller shouldReloadTableForSearchString:(NSString *)searchString {
[self filterResults:searchString];
return YES;
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
/*
#pragma mark - Navigation
// In a storyboard-based application, you will often want to do a little preparation before navigation
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
// Get the new view controller using [segue destinationViewController].
// Pass the selected object to the new view controller.
}
*/
#end
Is there any reason why certain users would not show up? I have checked the obvious things, making sure the users have the same "schoolName" and "isTeacher" is true but I'm stumped. Attached is a screenshot of an example user in the parse core

Answer 1

The default limit for a Parse query is 100 objects so even though you expect 170 PFObjects, you need to specify that you want to receive 170+ objects from your query in order to receive them all from the query using the limit parameter, ex:
PFQuery *query = [PFQuery queryWithClassName:#"_User"];
[query whereKey:#"isTeacher" equalTo:#"True"];
[query setLimit: 1000]; // <-- increase the limit up to 1000
The upper limit for the number of PFObjects a PFQuery can return though is 1000, so since you have more than 1000 users and could hypothetically need to receive more than 1000 results when performing a different query, you can do so by looping through multiple queries while utilizing an increasing skip parameter, to specify the "number of objects to skip before returning any."
So whereas that first block of code I wrote will return the first 1000 objects from that query, the next 1000 can be retrieved like so:
PFQuery *query = [PFQuery queryWithClassName:#"_User"];
[query whereKey:#"isTeacher" equalTo:#"True"];
[query setLimit: 1000]; // <-- increase the limit up to 1000
[query setSkip: 1000]; // <-- skip the first 1000 already found
And generally speaking, although it's probably best to receive your results bit by bit and increment setSkip to receive more results only when you absolutely need them, you can hypothetically retrieve all the objects matching your query at once, like so:
- (void)theOriginalCallingMethod {
// Start out by fetching the maximum number of results
// from the query and start at the beginning, i.e.
// not skipping anything
[self performTeacherQueryWithLimit:1000 andSkip:0];
}
- (void)performTeacherQueryWithLimit:(int)limit andSkip:(int)skip {
PFQuery *query = [PFQuery queryWithClassName:#"_User"];
[query whereKey:#"isTeacher" equalTo:#"True"];
[query setLimit: limit];
[query setSkip: skip];
[query findObjectsInBackgroundWithBlock:^(NSArray *objects, NSError *error) {
// If the maximum number of objects is found, there
// may be more, so continue querying
if (objects.count == limit) {
// Perform the query using the same limit, but increase
// the skip amount by that current limit to indicate
// that the next query should skip the results we just
// found
[self performTeacherQueryWithLimit:limit andSkip:skip+limit];
}
// ...other code...
}];
}
Note: This will only work with a PFTableView as long as its paginationEnabled property is set to NO.