[Catalyst] HTML::Widget, callback constraint, and multiple records per form

Jason Kohles email at jasonkohles.com
Fri Sep 1 22:58:45 CEST 2006

On 9/1/06, Ben Hopkins <hopkins.ben at gmail.com> wrote:
> Boy is my face red!
>  What a stupid mistake!  Thanks for noticing it.
>  Hmmm.  Makes me think now.  The see_if_exists subroutine now gets the value
> in the form, but doesn't have any context (to do a
> $c->model('electionsDB::County')->find... call).  If I made
> a subroutine that returns a coderef to a snippet that has the context in it
> ...
You can work around that pretty easily, by making the callback an
inline sub ref...

sub make_counties_widget {
    my ($self, $c) = @_;

    my $w = $c->widget('county_form')->method('post');

    for my $f (1..10) {
        $w->element('Textfield', "name$f")->label('County Name:');
        $w->constraint('Callback', "name$f")->callback(sub {
            my ( $value ) = @_;
            return see_if_exists( $value, $c );

    $w->element('Submit', 'Submit')->value('Submit');
    return $w;

Jason Kohles
email at jasonkohles.com - http://www.jasonkohles.com/
"A witty saying proves nothing."  -- Voltaire

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