Re: Question about predicates and list properties.
Re: Question about predicates and list properties.
- Subject: Re: Question about predicates and list properties.
- From: Keary Suska <email@hidden>
- Date: Wed, 26 May 2010 08:35:21 -0600
On May 26, 2010, at 7:39 AM, Graham Cox wrote:
> I have a property 'categories' of an object that returns a list (an array) of objects, which in turn have a property 'name'.
>
> Can I set up a NSPredicate that can match a string against any name in this list? How?
>
> In IB I set the left hand side to 'categories.name' but I get the error that "Can't do a substring operation with something that isn't a string", which on reflection makes sense.
>
> I could add a property that does return a single string by combining all the names into a comma delimited list, but I was hoping there might be a way to define such a predicate without resorting to that (and also such an approach loses the ability to correctly match 'begins with', 'ends with' and so on).
Not enough info: are you using Core Data, or a simple modeled relationship? I assume the issue is about traversing a relationship--otherwise the solution is trivial...
Keary Suska
Esoteritech, Inc.
"Demystifying technology for your home or business"
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