Re: NSPredicate with non-string keys
Re: NSPredicate with non-string keys
- Subject: Re: NSPredicate with non-string keys
- From: Ben Einstein <email@hidden>
- Date: Mon, 23 Mar 2009 17:53:56 -0400
I'm filtering an array of dictionaries, my usual procedure for doing
this is:
NSPredicate *predicate = [NSPredicate predicateWithFormat:@"MyKey
CONTAINS[cd] %@", searchString];
NSArray *filteredArray = [[self dataArray]
filteredArrayUsingPredicate:predicate];
So your comment about lowercase keys is only true for KVC compliance
(filtering non-plist objects), not when filtering arrays of
dictionaries, where numbers ARE valid keys. But NSPredicate doesn't
seem to think so.
Ben
On Mar 23, 2009, at 5:48 PM, Kyle Sluder wrote:
On Mon, Mar 23, 2009 at 5:18 PM, Ben Einstein <email@hidden>
wrote:
So is there any way to filter with numberic keys? I guess I could
convert
all they keys to strings? Urgh....
First, arrays don't have keys. I'm assuming you mean you need to
filter the items based on values for keypaths off those objects.
And no, numbers are not valid keys. Keys must begin with a lowercase
letter: http://developer.apple.com/documentation/Cocoa/Conceptual/KeyValueCoding/Concepts/BasicPrinciples.html#/
/apple_ref/doc/uid/20002170-183455
--Kyle Sluder
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