object system with chained mutators?

metaperl has asked for the wisdom of the Perl Monks concerning the following question:

Since chained mutators are not likely/easy/robust in Moose, I need to find a similar tool which does support things like below:

 use Mouse;
 has 'body' => (is => 'rw');
 has 'hdr' => (is => 'rw');
 has 'ftr' => (is => 'rw');

 1;

 my $m = Doc->new;
 $m->body('double')->hdr->('headless')->ftr('soccer');
[download]

It appears that Fey has some technology like this under the hood based on the synopsis example:

 $select->select( $user->columns( 'user_id', 'username' ) )
         ->from( $user, $group )
         ->where( $group->group_id, 'IN', 1, 2, 3 )
         ->and  ( $func, 'LIKE', 'smith%' );
[download]

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Re: object system with chained mutators? by Corion (Patriarch) on Feb 12, 2009 at 14:58 UTC
If Fey does what you want, why don't you take the relevant code out and use it? Maybe look at the source of Fey::SQL::Select, which implements the stuff. Basically, it's just not a Moose thing but implemented as routines that do stuff and then return `$self`. Certainly not rocket surgery.	[reply] [d/l]
Re^2: object system with chained mutators? by metaperl (Curate) on Feb 12, 2009 at 18:02 UTC
I would prefer something on CPAN with a history of popular use.	[reply]
Re^3: object system with chained mutators? by dragonchild (Archbishop) on Feb 18, 2009 at 15:00 UTC
Then contribute to Moose. stvn would love for someone to add that MooseX package. My criteria for good software: Does it work? Can someone else come in, make a change, and be reasonably certain no bugs were introduced?	[reply]
Re: object system with chained mutators? by Arunbear (Prior) on Feb 12, 2009 at 16:00 UTC
From the synopsis of Class::Accessor::Chained : `package Foo; use base qw( Class::Accessor::Chained ); __PACKAGE__->mk_accessors(qw( foo bar baz )); my $foo = Foo->new->foo(1)->bar(2)->baz(4); print $foo->bar; # prints 2` [download]	[reply] [d/l]