What is the best way to filter NSSDictionaty?

Question

Objective-C

Actually, this schedule is being parsed - www.bsuir.by/psched/rest/160801, the group may vary ( www.bsuir.by/psched/schedulegroup). As a result, I drive a lot of NSArray into NSDictionary , in which NSDictionary is again stored, which already contains the necessary information by key ("teacher" for example). It is necessary to filter the entire main NSDictionary by 3 stages that decrease by filtering ranking:
-day of the week
- current week (in the university, the countdown of weeks starts from September 1, and this par is set by the user)
-subgroup (again by the user).
What is the best way to organize an entity that will produce the necessary information at the output?
I have already made an option where everything is filtered by ranking, a lot of code is repeated and there is a lot of it, which is disgusting.

Answer 1

I so understood that basically a question on a subject of a choice of structure of entities. To do this, it would be nice to see the requests themselves. The simplest is to keep a Subject object with the fields: Title, Instructor, Room/Location, Start Time, Duration.
I would directly bind to the essence of the base (MagicalRecord will do an excellent job with this task), and then we filter it.
Regarding filtering, as @morozovdenis wrote , the NSPredicate class is used.
Separately, I’ll add that any framework / lib for working with databases already probably has built-in filtering and sorting capabilities, just go over any tutorial / docs.

Answer 2

according to the links, I have errors
parsing into typed objects (just objects or CoreData) and it is already easier to filter them from different sides (NSPredicate)