CODEWITHSUNDEEP
ioscore-data
Yury Pogrebnyak
Yury Pogrebnyak

Reputation: 4173

CoreData: persistent and temporary storage

I plan to use CoreData API for storing files in my iOS app. I want to have two stores of data: first, large, but possibly temporary, for caching; and second - small, but I want to ensure the data is persistent and never deleted. What are the best practices for doing this?

Upvotes: 2

Views: 1107

Answers (1)

Wain
Wain

Reputation: 119021

You need to create 2 separate Core Data 'stacks' - i.e. 2 different models (assuming the stored data is different in each), persistent stores, persistent store coordinators and managed object contexts. Both stacks will save the model to a file, but your temporary file should save into NSTemporaryDirectory (or perhaps better a cache directory) whereas your permanent file should be saved into NSHomeDirectory.

Other than that the usage of Core Data is nothing special. You just need to use the appropriate managed object context for the data you are saving / retrieving.

If you wanted to move any objects from one store to the other you would need to write the code to do that (i.e. get the object, create a new object in the other store and then copy each attribute across - use dictionaryWithValuesForKeys: and setValuesForKeysWithDictionary:).

Upvotes: 2

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