Restkit to-many relationship append to set instead of setting a new set
I have a iOS Restkit related question. I have a parent-child relationship data coming from a remote server and map those object to a NSManagedObject object with Restkit. The problem that I am currently having is every request to the server always wipe out the "child" relationship and replace it with the new data coming from the server. Is there a way to avoid those and append the new child instead? For example: I have a classic Category --> Products relationship. {"categories": [ { "cat_id": "1", "cat_title": "category 1", "cat_tag": 1, "product": [ { "prod_id": "1", "prod_name": "product 1",