CGI::Application and $self->param() wierdness

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

Hello Monks! I've run into yet another C::A puzzler. Specifically, I can create a $self->param() value in my CGI script and retrieve it in any non-setup() method. Why can't I retrieve the value in the setup() method? The docs say:

This function is a good place to define properties specific to your application via the $webapp->param() method.

Granted the doc example given only shows creation of properties rather than retrieval, but why shouldn't it work? Thanks in advance.

WebApp.cgi

#!/usr/local/bin/perl
use WebApp;
my $webapp = WebApp->new();
$webapp->param( 'var1' => 'val1' );
$webapp->param( 'var2' => 'val2' );
$webapp->run;
[download]

WebApp.pm

package WebApp;
use base 'CGI::Application';
use strict;
use warnings;

my ( $var1, $var2 );

sub setup {
   my $self = shift;
   $self->start_mode( 'my_page' );
   $self->run_modes([
      'my_page'
   ]);
   $var1 = $self->param( 'var1' );
}

sub my_page {
   my $self = shift;
   $var2 = $self->param( 'var2' );
   return "<p>var1: '$var1'</p>\n" .
          "<p>var2: '$var2'</p>\n";
}

1;
[download]

output

<p>var1: ''</p>
<p>var2: 'val2'</p>
[download]

Comment on CGI::Application and $self->param() wierdness Select or Download Code

Replies are listed 'Best First'.

Re: CGI::Application and $self->param() wierdness
by samtregar (Abbot) on Jul 08, 2004 at 03:15 UTC

-sam

[reply]

Re^2: CGI::Application and $self->param() wierdness

by Anonymous Monk on Jul 08, 2004 at 05:26 UTC

Thank you. I feel kind of silly. I was familiar with the PARAMS option on the new method, but didn't realize the significance/difference. Works fine after modification.

[reply]

Re: CGI::Application and $self->param() wierdness
by PodMaster (Abbot) on Jul 07, 2004 at 23:03 UTC

CGI::Application::Loop

package HI;
use base qw[ CGI::Application ];
sub setup { warn "I AM SETUP!!!!!!!!!!!!!!!!!!" }
package main;
my $hi = HI->new();
warn "Got myself a HI, now I gotta RUN IT!!!!!!!!!!!!!!!!!";
$hi->run;
__END__
I AM SETUP!!!!!!!!!!!!!!!!!! at - line 3.
Got myself a HI, now I gotta RUN IT!!!!!!!!!!!!!!!!! at - line 6.
No such run mode 'start' at - line 7
[download]

MJD says "you can't just make shit up and expect the computer to know what you mean, retardo!"
I run a Win32 PPM repository for perl 5.6.x and 5.8.x -- I take requests (README).
** The third rule of perl club is a statement of fact: pod is sexy.

[reply]
[d/l]

Re: CGI::Application and $self->param() wierdness
by dragonchild (Archbishop) on Jul 08, 2004 at 12:58 UTC

------
We are the carpenters and bricklayers of the Information Age.

Then there are Damian modules.... *sigh* ... that's not about being less-lazy -- that's about being on some really good drugs -- you know, there is no spoon. - flyingmoose

I shouldn't have to say this, but any code, unless otherwise stated, is untested

[reply]

Re^2: CGI::Application and $self->param() wierdness

by Anonymous Monk on Jul 08, 2004 at 15:25 UTC

Yes, my actual application will only grab it where I need to use it. I was just concerned that I couldn't grab the value in the setup() method.

For the sake of completeness (of the contrived example, not my real code), the following is the altered WebApp.cgi:

#!/usr/local/bin/perl
use WebApp;
my $webapp = WebApp->new(
      PARAMS => {
         'var1' => 'val1',
         'var2' => 'val2',
      },
);
$webapp->run;
[download]

[reply]
[d/l]

Re^3: CGI::Application and $self->param() wierdness

by dragonchild (Archbishop) on Jul 08, 2004 at 15:37 UTC

------
We are the carpenters and bricklayers of the Information Age.

Then there are Damian modules.... *sigh* ... that's not about being less-lazy -- that's about being on some really good drugs -- you know, there is no spoon. - flyingmoose

I shouldn't have to say this, but any code, unless otherwise stated, is untested

[reply]


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