Re: storing ivars in core data docs
Re: storing ivars in core data docs
- Subject: Re: storing ivars in core data docs
- From: Quincey Morris <email@hidden>
- Date: Wed, 23 Dec 2009 04:10:19 -0800
On Dec 23, 2009, at 03:28, Rob Keniger wrote:
> On 23/12/2009, at 9:18 PM, Quincey Morris wrote:
>
>> What's a doc? Seriously, are you talking about a file, or a NSPersistentDocument subclass instance, or what?
>>
>> If you're asking "Is it possible to archive arbitrary values as raw binary data or perhaps using the NSKeyedArchiver mechanism in a persistent store alongside but not within the Core Data database?" then the answer is no. You have to implement persistent storage for a value kept in a regular ivar as a property of some Core Data entity using the techniques described in the Core Data documentation.
>
>
> That's not 100% true, you can store an NSFileWrapper that contains a Core Data store as well as other files, so you can store whatever data you like. See this sample code for an example:
>
> http://developer.apple.com/mac/library/samplecode/PersistentDocumentFileWrappers/
>
> It's not perfect but it certainly works.
Well, FWIW it was 100% true because I deliberately specified "in a persistent store". :)
A file wrapper (or, *shudder*, a resource fork) might be a solution for a determined person, but it would be far easier to embed the data in a Core Data property.
Assuming that this is what the OP is asking about to begin with.
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