Re: Determine keys used in NSPredicate
Re: Determine keys used in NSPredicate
- Subject: Re: Determine keys used in NSPredicate
- From: Keary Suska <email@hidden>
- Date: Sat, 19 Oct 2013 22:58:36 -0600
On Oct 19, 2013, at 10:44 PM, Trygve Inda wrote:
> I have an array of objects. These objects may have some dynamic properties
> handled with valueForUndefinedKey.
>
> If I create a predicate along the lines of:
>
> myObject.proertyA = something AND
> myObject.proertyB = somethingElse AND
> myObject.dynamicPropertyA = someOtherThing
>
>
> How can I look at myPredicate and determine that it uses dynamicPropertyA?
>
> Is it enough and safe to use [myPredicate predicateFormat] and then search
> the resulting string for dynamicPropertyA?
>
> The reason is that my dynamic properties can be removed and I would need to
> go and find all the NSPredicates that are using a property that is about to
> go away.
You could but I imagine it would be fragile. You may be better off building your predicates manually--NSComparisonPredicate/NSExpression gives you the introspection that you need.
HTH,
Keary Suska
Esoteritech, Inc.
"Demystifying technology for your home or business"
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