Core data unique entity attribute

Question

I have got entity with NSNumber like id. Then I receive web response with userProfile I create and save its entity with id. If I receive 2 the same userProfiles I have 2 entities in my base. How can I confine my base that it has only one entity with same user id?

Answer 1

Instead of always creating a new user profile when you receive data, use a fetch request to search for an existing profile. If you find one, update it and save. If you don't, then create a new one and save.