Hi Monks, I have the following class: 
package GSM::Cell;
use Moose;
use MooseX::AttributeHelpers;
use Data::Dumper;


has 'BCCH' => (is => 'rw', lazy => 1, default => &set_bcch);
has 'LAC'  => (is => 'ro', required => 1);
has 'CI'   => (is => 'ro', required => 1);
has 'NAME' => (is => 'rw', lazy => 1, default => &set_name);
has 'ID'  => (is => 'ro', lazy => 1, default => \&set_id);

with qw(SQLConnection);

sub set_id {
    my $self = shift;
    return join(',',$self->LAC,$self->CI);
}

sub set_bcch {
    my $self = shift;
    my $sth = $self->dbh->prepare('select BCCHFrequency from Cell wher
+e CI = ? and LAC = ?);
    $sth->execute($self->CI,$self->LAC);
    return $sth->fetchrow_array;
}

sub set_name {
    my $self = shift;
    my $sth = $self->dbh->prepare('select UserLabel from Cell where CI
+ = ? and LAC = ?');
    $sth->execute($self->CI,$self->LAC);
    return $sth->fetchrow_array;
}


no Mouse;
__PACKAGE__->meta->make_immutable;

1; #so the 'require' or 'use' succeeds

[download]
The SQLConnection role provides a DB handle to a mysql database. When an object is instantiated (example my $cell = GSM::Cell->new('LAC' => 203, 'CI' => 20021)), i would like the other attributes (BCCH,NAME) to be initialized with values from the mysql database. This is currently the purpose of the default functions set_name and set_bcch. While this works, i was hoping to use moose meta-programming to arrive at a DRYer solution. See http://babyl.dyndns.org/techblog/2009/05/moose-attribute-meta-meddling.html for a neat idea. The idea is that the resulting attributes would look something like this: 
has BCCH => (
    metaclass => 'SQLInitilaize',
    is => 'ro', 
    table => 'Cell',
)

[download]
with package SQLInitialize extendeding Moose::Meta::Attribute and implementing the necessary logic. The problem is that i would need access to the instance data $self->LAC and $self->CI for the SQL lookup (as can be seen in the set_bcch and set_name methods.
My questions on this:
1) Is there some way to access $self in the scenario described above?
2) Is there perhaps a better/more elegant approach to achieve the above?
3) Currently i am providing the DB handle to objects that need it via the SQLConnection role. I am not sure this is the best solution.
Any comments or suggestions ??

In reply to Moose, SQL and initialization via Moose::Meta::Attribute by ZAmonk

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