PFQuery with multiple constraints on one key - ios

Question

i have parse.com database. i have column in a table named "text".
i have to find text with multiple keys matching with AND condition.
i tried it all ways. i tried to use:
PFQuery *query=[PFQuery queryWithClassName:#"post"];
[query whereKey:#"text" containedIn:Array];
or
PFQuery *query=[PFQuery queryWithClassName:#"post"];
[query whereKey:#"text" containsAllObjectsInArray:Array];
or
PFQuery *query=[PFQuery queryWithClassName:#"post"];
for (NSString *str in filtersArray) {
[query whereKey:#"text" containsString:str];
}
but no one works. please guide me if parse sdks supports this or not totally? if yes how can i achieve the results.
many thanks in advance :)
EIDT:
for example i have three entries in database as text:
"i have a data entry"
"i can not find something in data"
"how can i do this"
if pass "i" and "this" it should return entry (3)
if pass "i" and "data" it should return entry (1,2)
if pass "i" and "else" it should return nothing

Answer 1

The reason your query doesn't work is because Parse does not support having the same constraint (in this case 'containsString:') more than once on the same key.
So, what I would suggest is to query for a regular expression which will match all of your filter strings using - (instancetype)whereKey:(NSString *)key matchesRegex:(NSString *)regex.
NSArray *qryStrings = #[str1, str2, str3, ....]; //strings you are trying to match
//string which will hold our regular expression
NSString *regexString = #"^"; //start off the regex
for (NSString *str in qryStrings) { //build the regex one filter at a time
regexString = [NSString stringWithFormat:#"%#(?=.*%#)", regexString, str];
}
regexString = [NSString stringWithFormat:#"%#.*$", regexString]; //finish off the regex
PFQuery *query = [PFQuery queryWithClassName:#"post"];
[query whereKey:#"text" matchesRegex:regexString];
[query findObjectsInBackgroundWithBlock:^(NSArray *objects, NSError *error) {
if (!error) {
//objects array contains matching rows with matching strings
}
else {
NSLog(#"%# %#", error, [error userInfo]);
}
}];

Answer 2

Depending on the speed requirements of your query and the number of objects being queried, I would try separating the results using componentsSeparatedByString: after enumerating through the results array using something like: for(NSString *string in results). After separating each string into an individual array, use an if(...) statement that determines if that collection of words contains each word searched.
Code example:
NSMutableArray *searchResults = [[NSMutableArray alloc] init];
PFQuery *query=[PFQuery queryWithClassName:#"post"];
// consider setting a limit, depending on the number of posts
// consider sorting the query as needed
NSArray *posts = [query findObjects];
for(NSString *text in posts)
{
NSArray *words = [text componentsSeparatedByString:#" "]; // use SeperatedByCharactersInSet: for . , or anything else you'd need
switch ([filterArray count])
{
case 1:
if([words containsObject:filterArray[0]])
{
[searchResults addObject:text];
}
break;
case 2:
if([words containsObject:filterArray[0]] &&
[words containsObject:filterArray[1]])
{
[searchResults addObject:text];
}
break;
// case n:
// if([words containsObject:filterArray[0]] &&
// [words containsObject:filterArray[1]] &&
// [words containsObject:filterArray[n]])
// {
// [searchResults addObject:text];
// }
//
// break;
default:
break;
}
_filteredResults = [NSArray arrayWithArray:searchResults]; // local global instance of results - use for maintaining order (be sure to clear it between searches)
The _filteredResults array should be what you're wanting. Be sure to consider speed and the character separators used in the search though.

Answer 3

You simply just need to use whereKey:containsString:
And if you want to use additional parameters, you just simply add a subQuery

Answer 4

Your solution need to modify a bit.
Like this.
PFQuery *query=[PFQuery queryWithClassName:#"post"];
[query whereKey:#"text" containedIn:Array];
[query findObjectsInBackgroundWithBlock:^(NSArray *objects, NSError *error) {
//what your logic you want to write there might comes some records that are counts two times so you can remove those using NSSet
}];