Need help untangling inheritance and scope in CGI::App module.

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

And another one, if I may . . .

The code below are the relevant excerpts from the module we're building here. But this one is confusing me. This database conection was working for me before I commented it out of cgiapp_init() and tried to offload the work into a new dbh() routine.

The errors read: "Error executing class callback in init stage: Can't call method "config_file" on an undefined value at /home/hesco/anmc/sb/Registration/Registration/lib/Registration/WWW/RegForm.pm line 114." Line 114 is a part of the dbh() routine and reads: $self->config_file('/var/lib/cf/tbd/regform/Registration.ini');

So what here is the undefined value? Isn't $self defined? Why wouldn't it be passed from cgiapp_init? If not $self, then how is it that a hard coded path would be undefined?

I don't get it?

-- Hugh

package Registration::WWW::RegForm;

use warnings;
use strict;
use diagnostics;

use base 'CGI::Application';
use CGI::Application::Plugin::Config::Simple;
  .  .  .  
use CGI::FormBuilder;
use CGI;

  .  .  .  

sub cgiapp_init {
  my $self = shift;
  $self->config_file('/var/lib/cf/tbd/regform/Registration.ini');
  my $lib = $self->config_param('library');
  push @INC, $lib;
  # use lib qw{/home/hesco/anmc/sb/Registration/Registration/lib};
  require Registration::WWW::htmlgui;
  require Registration::DB;
  my $dbh = dbh();
  # my $dbh = Registration::DB->connect($self->config_param('db_engine
+'),$self->config_param('host_name'),$sel
f->config_param('db_name'),$self->config_param('db_user'),$self->confi
+g_param('db_pw'));
  my $result = auth_config($dbh);
}

sub dbh {
  my $self = shift;
  $self->config_file('/var/lib/cf/tbd/regform/Registration.ini');
  my $dbh = Registration::DB->connect(
    $self->config_param('db_engine'),
    $self->config_param('host_name'),
    $self->config_param('db_name'),
    $self->config_param('db_user'),
    $self->config_param('db_pw')
  );
  return $dbh;
}
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Comment on Need help untangling inheritance and scope in CGI::App module. Download Code

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Re: Need help untangling inheritance and scope in CGI::App module.
by gryphon (Abbot) on May 02, 2006 at 00:31 UTC

Greetings hesco,

I haven't tested this, but just looking briefly at your code, the first thing I'd try is to change the 8th line of cgiapp_init() to this:

my $dbh = $self->dbh();
my $result = auth_config($dbh);
# ...or instead, simply...
my $result = auth_config($self->dbh());
[download]

Inside your sub dbh, you shift off the first element of @_, but calling dbh() directly means you're not passing anything into the sub. Calling $self->dbh() will fix this.

gryphon
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code('Perl') || die;

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