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Re: Moose Type Constraints violations to warnings?

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From:
Ævar Arnfjörð Bjarmason
Date:
June 13, 2011 09:45
Subject:
Re: Moose Type Constraints violations to warnings?
Message ID:
BANLkTikUWA623DhuPXN5aXTK8bHwO+Sx5g@mail.gmail.com
On Mon, Jun 13, 2011 at 18:39, Ævar Arnfjörð Bjarmason <avarab@gmail.com> wrote:
> For Mouse this monkeypatching would work:

And this would work for Moose:

    package Foo;
    use Moose;
    {
    package Moose::Meta::Attribute;

    sub verify_against_type_constraint {
        my $self = shift;
        my $val  = shift;

        return 1 if !$self->has_type_constraint;

        my $type_constraint = $self->type_constraint;

        $type_constraint->check($val)
            || Carp::cluck("Attribute ("
                     . $self->name
                     . ") does not pass the type constraint because: "
                     . $type_constraint->get_message($val), data => $val, @_);
    }
    }

    has x => (is => "ro", isa => "Int");
    my $foo = Foo->new(x => "blah");
    use Data::Dumper;
    print Dumper $foo;

And give you:

    $ perl -Ilib /tmp/error.pl
    Subroutine RegexpRef redefined at
lib/Moose/Util/TypeConstraints/OptimizedConstraints.pm line 35.
    Subroutine verify_against_type_constraint redefined at /tmp/error.pl line 6.
    Attribute (x) does not pass the type constraint because:
Validation failed for 'Int' with value
blahdatablahinstanceFoo=HASH(0x1edadb0) at /tmp/error.pl line 14
            Moose::Meta::Attribute::verify_against_type_constraint('Moose::Meta::Attribute=HASH(0x27e0078)',
'blah', 'instance', 'Foo=HASH(0x1edadb0)') called at
lib/Moose/Meta/Attribute.pm line 1125
            Moose::Meta::Attribute::_coerce_and_verify('Moose::Meta::Attribute=HASH(0x27e0078)',
'blah', 'Foo=HASH(0x1edadb0)') called at lib/Moose/Meta/Attribute.pm
line 485
            Moose::Meta::Attribute::initialize_instance_slot('Moose::Meta::Attribute=HASH(0x27e0078)',
'Moose::Meta::Instance=HASH(0x27ad5c0)', 'Foo=HASH(0x1edadb0)',
'HASH(0x1ec8f90)') called at lib/Class/MOP/Class.pm line 575
            Class::MOP::Class::_construct_instance('Moose::Meta::Class=HASH(0x266bab0)',
'HASH(0x1ec8f90)') called at lib/Class/MOP/Class.pm line 548
            Class::MOP::Class::new_object('Moose::Meta::Class=HASH(0x266bab0)',
'HASH(0x1ec8f90)') called at lib/Moose/Meta/Class.pm line 252
            Moose::Meta::Class::new_object('Moose::Meta::Class=HASH(0x266bab0)',
'HASH(0x1ec8f90)') called at lib/Moose/Object.pm line 22
            Moose::Object::new('Foo', 'x', 'blah') called at
/tmp/error.pl line 23
    $VAR1 = bless( {
                     'x' => 'blah'
                   }, 'Foo' );

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