CODEWITHSUNDEEP
iosobjective-ccore-data
Alexy Ibrahim
Alexy Ibrahim

Reputation: 556

Cast object to id

I have an object which inherits from NSObject & I wish to save it in CoreData, I have already create an attribute of type "Transformable" (which is "id"), so I cannot save the project directly when adding it to the database, for example:

item.idObject = object;

it will generate an error, I think the problem is that I should transform object into id, how can I do this?

Upvotes: 1

Views: 118

Answers (2)

Abizern
Abizern

Reputation: 150615

You're on the right track by setting the attribute to transformable. But what you also have to to is to write a valueTransformer for this object that Core Data can use.

There is more in the Documentation

Upvotes: 2

Grady Player
Grady Player

Reputation: 14549

when you assign a core data property, it may only be of certain types, NSString, NSNumber etc... if you assign a relationship, it must be another NSManagedObject instance, if you want to save it as part of the model, you can of course have transient properties of any type.

so...

@implimentation OurClass

@dynamic someProperty; // core data model property NSNumber, NSString, etc.
@dynamic someRelationship; // core data relationship some other subclass of NSManagedObject
@synthesized someOtherProperty; // can be anything, following normal Objective-C semantics.

@end

Upvotes: 0

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