parse.com - Parse NSPredicate with nil option for finding any object -


i have tried search web, , didn't came across subject regarding default fallbacks nspredicate driven queries.

for instance want query jokes category.

so got little helper method:

- (pfquery)queryjokeswithcategory:(pfobject *)category language:(nsstring *)language {      nspredicate *predicate = [nspredicate predicatewithformat:@"language = %@ , category = %@", language, category];     pfquery *jokes = [pfquery querywithclassname:@"joke" predicate:predicate];     return jokes; }

if pass nil category expect jokes, doesn't give me single. this:

pfquery *jokesquery = [self queryforjokeswithcategory:nil language:@"en"];

are there ways approach? keywords specific have missed?

what want in situation check if "category" key exists, , in case, will, run query:

nspredicate *predicate = [nspredicate predicatewithformat:@"language = %@ , category in self", language]; pfquery *jokes = [pfquery querywithclassname:@"joke" predicate:predicate]; return jokes;

this query query joke table jokes specified language, disregarding category, ensuring defined.

edit:

i don't know how app works, sounds user needs enter category , language, , want construct query based on entry. have check see if field category empty, , query posted above, , if wasn't empty, use original query. don't think can accomplish in 1 query, though.

as suggestion, maybe make category field mandatory, or have "view all" button view jokes under selected language.


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