Re: [cgiapp] Constraint routines in CGI::A::ValidateRM

[Cees Hek <suppressed>]

John Day wrote:
> Now, lets say I have a sign-up form. If somebody is signing up I want
> to check if the username or the email address are already in use. If
> they are I do not want to open a new account. When I call the
> constraint routine I can pass variables from within the DFV object,
> but can I pass something like a DBI database handle?

You can do that with an anonymous subroutine.  I use the following 
conventions in my code:

my $users = My::Users->new;
...
constraints => {
  email => [ {
               name       => 'format',
               constraint => 'email'
             }, {
               name       => 'exists',
               constraint => sub {
                  !$users->search(email => lc $_[0]);
               }
             }
  ],
}

So if search turns up a valid response, then the test fails.

Then I massage the data I get back from D::FV and in my templates I use 
something like the following to identify the problem (note that I use 
Template Toolkit instead of HTML::Template, but either will work):

[% IF invalid || missing %]
  <div style="text-align: center; color: red">
    There were problems processing your request:
  </div>
  <div style="text-align: center; color: red; font-size: 80%">
  [% IF invalid.email.format %]The email address you provided does
                               not look valid<br />[% END %]
  [% IF invalid.email.exists %]The email address you provided is
                               already registered<br />[% END %]
  [% IF missing.email %]You have to provide an email address<br />[% END %]
  </div>
[% END %]


Cheers,

Cees


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