Using predicates to search nested arrays in iOS 5

Question

I have an array of Address Book contact dictionaries, with the dictionary for each name containing a string for the name and an array of email addresses. Here's a snippet of what the NSLog output looks like when I log the array of contacts:

{
    emails =         (
        "[email protected]"
    );
    name = "Some Name";
},
{
    emails =         (
        "[email protected]",
        "[email protected]"
    );
    name = "John Q. Public";
},
[etc.]

I want to use a predicate to search these dictionaries by email address, returning any and all entries that have at least one email address that matches the search term.

So far, I have tried the method described in this question, just using CONTAINS, like so:

NSPredicate *predicate = [NSPredicate predicateWithFormat:@"emails CONTAINS[c] %@", searchString];

but any search just returned an empty array. If I search the name field instead, like so, it works fine:

NSPredicate *predicate = [NSPredicate predicateWithFormat:@"name CONTAINS[c] %@", searchString];

So I'm pretty sure it's specifically with searching the array. Ideas?

Joshua Conner · Accepted Answer · 2012-04-30 01:58:28Z

6

Aaand I figured it out. This works:

NSPredicate *predicate = [NSPredicate predicateWithFormat:@"ANY emails CONTAINS[c] %@",currentString];

Thanks for being my rubber ducky, SO.

answered Apr 30, 2012 at 1:58

Joshua Conner

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