Re: Core Data or not
Re: Core Data or not
- Subject: Re: Core Data or not
- From: Ryan Dignard <email@hidden>
- Date: Sat, 06 Aug 2016 11:13:36 -0700
To do it as one fetch you can set your predicate (or a sub predicate)
as: [NSPredicate predicateWithFormat:@"%K in %@", primaryKey, keys] where
primaryKey is the name of your ID property, and keys is an array of ID
values which are "interesting" (as defined by the rest of your code).
On Sat, Aug 6, 2016 at 9:13 AM, Trygve Inda <email@hidden>
wrote:
> > On Aug 6, 2016, at 1:46 AM, Trygve Inda <email@hidden>
> wrote:
> >> For example, I would need to add items with ID# 204, 765, 983, 124, and
> 458
> >> to the array. This seems like with Core Data it would be 5 different
> >> fetches. Or is there some efficient way to fetch these 5 items in one
> >> request?
> >
> > You could add an entity to your data model that represents the custom
> > collection. It would have an attribute that is a one-to-many
> relationship to
> > InterestingObject. If you only have one of those manually-constructed
> tables,
> > your data store would only contain one instance of this entity. That's
> > perfectly okay.
> >
> > --Andy
> >
> >
>
> I can't do that at run time though. I need the user to be able to build
> custom collections (like a custom iTunes playlist) that is a subset of the
> full collection but not by any simple predicate criteria.
>
>
>
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