lib/MooseX/UndefTolerant/Constructor.pm

   1 package MooseX::UndefTolerant::Constructor;
   2 use Moose::Role;
   3
   4 if ( $Moose::VERSION < 1.9900 ) {
   5         around('_generate_slot_initializer', sub {
   6                 my $orig = shift;
   7                 my $self = shift;
   8
   9                 # note the key in the params may not match the attr name.
  10                 my $key_name = $self->_attributes->[$_[0]]->init_arg;
  11
  12                 # insert a line of code at the start of the initializer,
  13                 # clearing the param if it's undefined.
  14
  15                 if (defined $key_name) {
  16                         my $tolerant_code =
  17                              qq# delete \$params->{'$key_name'} unless # .
  18                              qq# exists \$params->{'$key_name'} && defined \$params->{'$key_name'};\n#;
  19
  20                         return $tolerant_code . $self->$orig(@_);
  21                 }
  22                 else {
  23                         return $self->$orig(@_);
  24                 }
  25         });
  26 }
  27
  28 no Moose::Role;
  29
  30 1;