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my $id = shift;

$id ||= $q->param('id');
...
}
    
$obj->update;

sub save_to_db {      
    my $self = shift;
    my $class_id = shift;
...
    # print data_form
    return $self->render_page('cp/cp_index.html', { educator_id    => 
+$class->educator }); 
} # end save_to_db()