Looking over that bit of code did the trick. A simple role did the trick.
role
{
around accessor_metaclass => sub
{
...
}
};
Thanks,
Roger
----- Original Message ----
From: Jesse Luehrs <d...@tozt.net>
To: moose@perl.org
Sent: Sat, November 7, 2009 11:53:20 AM
Subject: Re: Combining Trait Definition and Exporter In Same Module File
On Sat, Nov 07, 2009 at 08:03:14AM -0800, roger bush wrote:
> Here's how you currently need to use my trait:
>
>
> use MyCachedAttributeUtil;
>
> has 'my_cached_attribute' => (
> isa => 'ArrayRef[MyClass]',
> traits => ['Cached'],
> is => 'ro',
> lazy_build => 1,
> init_arg => undef,
> expire_seconds => 1,
> );
>
> cached 'my_cached_attribute';
>
>
> It seems there should be a way to eliminate the first line and last line, and
> have the trait
> (Cached) do everything. But I couldn't get this to work.
>
> There seem to be two issues:
>
> 1. The Cached Traits implementation is passed an anonymous class object,
> which does not
> give me access to the reader routine (in this case my_cached_attribute is
> the default
> reader). While I can get the name of the method, I wasn't actually able
> to modify the
> method by applying the "around" modifier. I solved this by putting
> the around modifier
> in the separate util module "MyCachedAttributeUtil", and adding it to the
> class in the
> call "cached 'my_cached_attribute'.
>
> I think the problem was I needed to "go up one level", because the symbol
> I needed
> to modify ('my_cached_attribute'), would have not been at the attribute
> level (the
> implementation would have been, but the name of the method is possibly
> one level up).
What you probably need to do here is modify how the accessor is
generated. MooseX::AttributeTree might be a good example of how to get
started.
> 2. When I attempt to put both the Moose::Export stuff (from
> MyCachedAttributeUtil) in
> the same module as the Moose::Role stuff (Cached Trait), things are
> unhappy.
> The exact error is that the new keyword "cached" which I export, doesn't
> seem to
> be recognized.
Yeah, probably don't do this. Keeping stuff in separate files makes
things cleaner all around.
-doy
