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Re: Moose Type Constraints violations to warnings?

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From:
Jesse Luehrs
Date:
June 13, 2011 16:56
Subject:
Re: Moose Type Constraints violations to warnings?
Message ID:
20110613235634.GF26428@tozt.net
On Mon, Jun 13, 2011 at 06:45:10PM +0200, Ævar Arnfjörð Bjarmason wrote:
> 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' );
> 

For the record, please please PLEASE don't do this. Attribute traits
exist for a reason.

-doy

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