Getting Extensible Attribute value from existing DHCP filter using Perl API

[#1]

I have IPv4 filters that contain HW addrs.  Each HW addr has a defined extensible attribute called "Security Zone". When I try to get them w/the code below, it fails w/this msg:

       Use of uninitialized value $zone in concatenation (.) or string at ./Infoblox.pl

---------------------

my @retrieved_objs = $session->get (
         object => "Infoblox:HCP::MAC",
         mac => "00:03:93:ae:32:0e",
);

foreach my $item (@retrieved_objs) {
         my $filter=$item->filter;

         print "$filter\n";
         my $attrs=$item->extensible_attributes();
         my $zone=$attrs->{'Security Zone'};
         print "$zone\n";
}

Thanks for any suggestions.

[#2]

The code is generally sound.  The error you're seeing is being returned from an object w/o the attribute defined.  If you just want to not get the error, you can do something like:

print "$zone\n" if $zone;

or return something more useful to find the offender, of course, like:

if ($zone) { print "$zone\n"; }

else { print $item->mac(),"\n"; }

[#3]

Should I be using a different object?  I've confirmed the extensible attribute exists for the HW addr.  The HW addr is under the filter. 

Thanks for your help.

[#4 · Accepted solution]

Are you trying to get the attrib off of each MAC entry, or the filter itself?  (Obviously, I'm only working from a snippet here, so I don't have full context.)

If per-MAC, I'd suggest putting in the if/else I posted earlier, and then go look at it and verify whether the attrib is in fact there, or if you possibly have something else suspicious.

[#5]

Was misreading the columns and the extensible attribute was spelled differently. All good, now.  Thanks, again, for your confirmation.

gary