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Hello Fine Monks,

References are giving me a big headache. Every time I think I have them figured out, Perl gently points out that I don't.

So here is the basic question: how do I access a hash that is created in one package and needed in another? It seems like that should be a simple question with a reasonably simple answer, but I keep banging my head up against a wall trying to get it to work. Below I will put trimmed down versions of my packages to illustrate my question more fully.

Package 1:

package Bio::DB::Das::Chado; use strict; use Bio::Root::Root; use vars qw(@ISA); @ISA = qw(Bio::Root::Root); sub new { my $class = shift; my $self = $class->SUPER::new(@_); # do some work here to extract a DBI $hashref my $cvterm_id; # this scalar is going to be a hashref while (my $hashref = $sth->fetchrow_hashref) { $$cvterm_id{$$hashref{termname}} = $$hashref{cvterm_id}; } return bless {dbh => $dbh, cvterm_id => $cvterm_id}, ref $self ||$self; } sub segment { my $self = shift; my ($name,$start,$end,$class,$version) = $self->_rearrange([qw(NAME START END CLASS VERSION)],@_); # _rearrange is in Bio::Root::Root; I'm allowed to use it # lets the Segment class handle all the lifting. return $self->Bio::DB::Das::Chado::Segment->new($name,$self,$start,$ +end); } 1;
Package 2:
package Bio::DB::Das::Chado::Segment; use strict; use Bio::Root::Root; use vars '@ISA'; @ISA = qw(Bio::Root::Root); sub new { my $self = shift; my ($name,$dbadaptor,$start,$end) = @_; #$dbadaptor is 'Bio::DB::Das::Chado' # now do all kinds of work validating and obtaining info my $cvterm_id = $dbadaptor->{cvterm_id}; # so $cvterm_id should be a reference to the same # hash referenced in the first package, right? return bless {dbadaptor => $dbadaptor, start => $start, end => $end, length => $length, srcfeature_id => $srcfeature_id, cvterm_id => $cvterm_id, name => $name }, ref $self ||$self; } sub features { my $self = shift; # do lots more stuff, mostly to build a sql query my %termhash = %{$self->{cvterm_id}}; # shouldn't this be a reference to the hash ref in this #package's constructor, that in turn is a ref to the # hash ref in the first package? my @keys = grep(/\sgene/i , keys %termhash ); # this fails because %termhash isn't a hash. return; } 1;
Any pointers would be appreciated. Thanks for looking through this code; I hope I usefully trimmed it down.
Thanks,

Scott
Project coordinator of the Generic Model Organism Database Project


In reply to Hash references moving between modules by scain

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