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package MooseX::UndefTolerant::Constructor;
our $VERSION = '0.21';
# applied to constructor method metaclass, for Moose < 1.9900
use Moose::Role;
use strict;
use warnings;
around _generate_slot_initializer => sub {
my $orig = shift;
my $self = shift;
# note the key in the params may not match the attr name.
my $key_name = $self->_attributes->[$_[0]]->init_arg;
# insert a line of code at the start of the initializer,
# clearing the param if it's undefined.
if (defined $key_name)
{
# leave the value unscathed if the attribute's type constraint can
# handle undef (or doesn't have one, which implicitly means it can)
my $type_constraint = $self->_attributes->[$_[0]]->type_constraint;
if ($type_constraint and not $type_constraint->check(undef))
{
my $tolerant_code =
qq# delete \$params->{'$key_name'} unless # .
qq# exists \$params->{'$key_name'} && defined \$params->{'$key_name'};\n#;
return $tolerant_code . $self->$orig(@_);
}
}
return $self->$orig(@_);
};
no Moose::Role;
1;
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