Re: CoreData "in" predicate
Re: CoreData "in" predicate
- Subject: Re: CoreData "in" predicate
- From: Rick Mann <email@hidden>
- Date: Sun, 2 May 2010 06:03:24 -0700
I saw that, I had hoped that by not specifying an attribute, it would mean the object itself, not an attribute on the object.
On May 2, 2010, at 05:58:39, Frederick Reimer wrote:
> The manuals for this give the following example:
>
> NSPredicate *inPredicate =
> [NSPredicate predicateWithFormat: @"attribute IN %@", aCollection];
>
> It looks like you are missing the attribute... If attribute can vary, you can use a %K and a NSString value representing the attribute name (it is not automatically enclosed in quotes as %@ values are).
>
> HTH,
>
> Fred
> On May 2, 2010, at 8:27 AM, Rick Mann wrote:
>
>> Hi.
>>
>> I have two entities: Mission and Favorite. Favorite has a single relation to Mission. I need to fetch all Mission objects that exist in Favorite. I'm using an NSFetchResultsController.
>>
>> I created an array with all the Mission objects found in the Favorite entity. Then I tried to create a predicate like this:
>>
>> NSPredicate* pred = [NSPredicate predicateWithFormat: @"in %@", favoriteMissions];
>>
>> and use that on a fetch of Mission objects. But it complains that it can't parse that format string.
>>
>> Clearly, this approach isn't going to work. I could store the Mission's key in the Favorite table instead, but that's less elegant. Might be the only way to go.
>>
>> Any suggestions?
>>
>> tia,
>> Rick
>>
>> _______________________________________________
>>
>> Cocoa-dev mailing list (email@hidden)
>>
>> Please do not post admin requests or moderator comments to the list.
>> Contact the moderators at cocoa-dev-admins(at)lists.apple.com
>>
>> Help/Unsubscribe/Update your Subscription:
>>
>> This email sent to email@hidden
>>
>
_______________________________________________
Cocoa-dev mailing list (email@hidden)
Please do not post admin requests or moderator comments to the list.
Contact the moderators at cocoa-dev-admins(at)lists.apple.com
Help/Unsubscribe/Update your Subscription:
This email sent to email@hidden