NAME

       MooX::HandlesVia - NativeTrait-like behavior for Moo.

VERSION

       version 0.001008

SYNOPSIS

         {
           package Hashy;
           use Moo;
           use MooX::HandlesVia;

           has hash => (
             is => 'rw',
             handles_via => 'Hash',
             handles => {
               get_val => 'get',
               set_val => 'set',
               all_keys => 'keys'
             }
           );
         }

         my $h = Hashy->new(hash => { a => 1, b => 2});

         $h->get_val('b'); # 2

         $h->set_val('a', 'BAR'); # sets a to BAR

         my @keys = $h->all_keys; # returns a, b

DESCRIPTION

       MooX::HandlesVia is an extension of Moo's 'handles' attribute functionality. It provides a means of
       proxying functionality from an external class to the given attribute. This is most commonly used as a way
       to emulate 'Native Trait' behavior that has become commonplace in Moose code, for which there was no Moo
       alternative.

SHORTCOMINGS

       Due to current Moo implementation details there are some deficiencies in how MooX::HandlesVia in
       comparison to what you would expect from Moose native traits.

       •   methods delegated via the Moo 'handles' interface are passed the attribue value directly. and there
           is no way to access the parent class. This means if an attribute is updated any triggers or type
           coercions WILL NOT fire.

       •   Moo attribute method delegations are passed the attribute value. This is fine for references
           (objects, arrays, hashrefs..) it means simple scalar types are READ ONLY. This unfortunately means
           Number, String, Counter, Bool cannot modify the attributes value, rendering them largely useless.

PROVIDED INTERFACE/FUNCTIONS

       process_has(@_)
           MooX::HandlesVia preprocesses arguments passed to has() attribute declarations via the process_has
           function. In a given Moo class, If 'handles_via' is set to a ClassName string, and 'handles' is set
           with a hashref mapping of desired moo class methods that should map to ClassName methods,
           process_has() will create the appropriate binding to create the mapping IF ClassName provides that
           named method.

             has options => (
               is => 'rw',
               handles_via => 'Array',
               handles => {
                 mixup => 'shuffle',
                 unique_options => 'uniq',
                 all_options => 'elements'
               }
             );

       The following handles_via keywords are reserved as shorthand for mapping to Data::Perl:

       •   Hash maps to Data::Perl::Collection::Hash::MooseLike

       •   Array maps to Data::Perl::Collection::Array::MooseLike

       •   String maps to Data::Perl::String::MooseLike

       •   Number maps to Data::Perl::Number::MooseLike

       •   Bool maps to Data::Perl::Bool::MooseLike

       •   Code maps to Data::Perl::Code

SEE ALSO

       •   Moo

       •   MooX::late

AUTHOR

       Matthew Phillips <mattp@cpan.org>

COPYRIGHT AND LICENSE

       This software is copyright (c) 2015 by Matthew Phillips <mattp@cpan.org>.

       This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5
       programming language system itself.