> 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.
My question is: After I have an NSPredicate built by the user with the Predicate editor, how can determine the keys that the NSPredicate uses? The user may set it up like: >> myObject.proertyA = something AND >> myObject.proertyB = somethingElse AND >> myObject.dynamicPropertyA = someOtherThing And then later want to get rid of the someOtherThing property in all the objects and I need to be able to know if any of the user's NSPredicates make a reference to someOtherThing _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) 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: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
