X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=blobdiff_plain;f=lib%2FMooseX%2FUndefTolerant%2FAttribute.pm;h=c1065aabcd870280d958965c4e0c242c4fedace9;hb=efcfddbdcfac9bcc3b9a8190f9fe3089199d65ec;hp=e1aee785532aee70daa72c6aefed89c485667324;hpb=5447ee457d5fd503926799cb8efb8552bdb4764d;p=gitmo%2FMooseX-UndefTolerant.git

diff --git a/lib/MooseX/UndefTolerant/Attribute.pm b/lib/MooseX/UndefTolerant/Attribute.pm
index e1aee78..c1065aa 100644
--- a/lib/MooseX/UndefTolerant/Attribute.pm
+++ b/lib/MooseX/UndefTolerant/Attribute.pm
@@ -1,15 +1,65 @@
 package MooseX::UndefTolerant::Attribute;
 use Moose::Role;
 
-around('initialize_instance_slot', sub{
+around('initialize_instance_slot', sub {
     my $orig = shift;
     my $self = shift;
 
-    # If the parameter passed in was undef, quietly do nothing but return
-    return unless defined($_->[2]);
+    my $ia = $self->init_arg;
+
+    # $_[2] is the hashref of options passed to the constructor. If our
+    # parameter passed in was undef, quietly do nothing but return.
+    return unless exists($_[2]->{$ia}) && defined($_[2]->{$ia});
 
     # If it was defined, call the real init slot method
     $self->$orig(@_)
 });
 
-1;
\ No newline at end of file
+1;
+
+=head1 NAME
+
+MooseX::UndefTolerant::Attribute - Make your attribute tolerant to undef intitialization
+
+=head1 SYNOPSIS
+
+  package My:Class;
+  use Moose;
+
+  use MooseX::UndefTolerant::Attribute;
+
+  has 'bar' => (
+      traits => [ qw(MooseX::UndefTolerant::Attribute)],
+      is => 'ro',
+      isa => 'Num',
+      predicate => 'has_bar'
+  );
+
+  # Meanwhile, under the city...
+
+  # Doesn't explode
+  my $class = My::Class->new(bar => undef);
+  $class->has_bar # False!
+
+=head1 DESCRIPTION
+
+Applying this trait to your attribute makes it's initialization tolerant of
+of undef.  If you specify the value of undef to any of the attributes they
+will not be initialized.  Effectively behaving as if you had not provided a
+value at all.
+
+=head1 AUTHOR
+
+Cory G Watson, C<< <gphat at cpan.org> >>
+
+=head1 COPYRIGHT & LICENSE
+
+Copyright 2009 Cory G Watson.
+
+This program is free software; you can redistribute it and/or modify it
+under the terms of either: the GNU General Public License as published
+by the Free Software Foundation; or the Artistic License.
+
+See http://dev.perl.org/licenses/ for more information.
+
+=cut