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Re: core data, boolean attribute, and dynamic
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Re: core data, boolean attribute, and dynamic


  • Subject: Re: core data, boolean attribute, and dynamic
  • From: Quincey Morris <email@hidden>
  • Date: Fri, 12 Aug 2011 09:57:31 -0700

On Aug 12, 2011, at 04:08 , Martin Hewitson wrote:

> In an app I have a core data model which has a File entity which has a boolean attribute isText. This attribute is declared in the corresponding NSManagedObject subclass interface as
>
> @property (assign) BOOL isText;
>
> and in the implementation I do
>
> @dynamic isText;
>
> In Lion, accessing this with
>
> [file isText]
>
> works fine. But it doesn't work on Snow Leopard. There I have to do
>
> [[file valueForKey:@"isText"] boolValue]
>
> Is this expected behaviour? Was/is something broken on SL that was fixed on Lion? Or is it now broken on Lion?

Yes. No. No.

It's new on Lion that the internal property accessors referenced by @dynamic support scalar types directly. In the past, if you wanted the type of property "isText" to BOOL rather than NSNumber, you had to write a custom getter and setter to make it so.

For as long as you need to support 10.6 and earlier, I think you'll have to supply the old-style custom implementations.

I don't think I watched the 2011 WWDC video on Core Data, but it's possible this issue is discussed in there, and there may be a more elegant workaround.


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