NSPredicate for inner key in array of dictonary

Question

i have an array of dictionay in the following format

    [
 {
      \"student\": {
        \"id\": \"1\",

        \"studentUserDetail\": {
          \"firstName         


        

Answer 1

NSPredicate *filter =  [NSPredicate predicateWithFormat:@"student.studentUserDetail.firstName CONTAINS[cd] %@ ", searchString];

worked perfectly for me