objective c - NSPredicate Crashes when trying to use CONTAINS -

the data structure want question. data transformable field in turn nsdictionary.

obj = { //...     nsdictionary *data:@{                          likespeople:@[@{@"username":@"jack",@"id":@"ae3132"}]                          } } 

what want search inside nsarray *fetchresult check there noone in likespeople x id . attempts on doing end crashing highlighting there problem in nspredicate declaration.

what doing wrong , how fetch information want?

socialwall *thesocialwall = fetchresult[0];         nslog(@"%@",thesocialwall.data);         nspredicate * predicate = [nspredicate predicatewithformat:@"data.likespeople contains(c) %@",myuser.userwebid];          nsarray * result = [fetchresult filteredarrayusingpredicate:predicate];         nslog(@"%@",result); 

not contains(c) contains[c]

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#import <foundation/foundation.h>  int main(int argc, char *argv[]) { @autoreleasepool {     nsdictionary *d = @{@"key":@"hi name dominik pich"};     nsarray *a = @[d];     nspredicate * predicate = [nspredicate predicatewithformat:@"key contains[c] %@",@"dominik"];     nsarray * result = [a filteredarrayusingpredicate:predicate];     nslog(@"%@",result); } }