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ASP4

    __PACKAGE__->belongs_to(
      sender  =>
        'App::db::user' =>
          'from_user_id'
    );
    

    __PACKAGE__->belongs_to(
      recipient =>
        'App::db::user' =>
          'to_user_id'
    );
    

    1;# return true:

Create your MasterPage like this:

File: `htdocs/masters/global.asp`

    <%@ MasterPage %>
    <!DOCTYPE html>
    <html>
      <head>
        <title><asp:ContentPlaceHolder id="meta_title"></asp:ContentPlaceHolder></title>
        <meta charset="utf-8" />
      </head>
      <body>
        <h1><asp:ContentPlaceHolder id="headline"></asp:ContentPlaceHolder></h1>
        <asp:ContentPlaceHolder id="main_content"></asp:ContentPlaceHolder>
      </body>
    </html>

File: `htdocs/index.asp`

    <%@ Page UseMasterPage="/masters/global.asp" %>
    

    <asp:Content PlaceHolderID="meta_title">Register</asp:Content>
    

    <asp:Content PlaceHolderID="headline">Register</asp:Content>
    

    <asp:Content PlaceHolderID="main_content">
    <%
      # Sticky forms work like this:
      if( my $args = $Session->{__lastArgs} ) {
        map { $Form->{$_} = $args->{$_} } keys %$args;
      }
      

      # Our validation errors:
      my $errors = $Session->{validation_errors} || { };
      $::err = sub {
        my $field = shift;
        my $error = $errors->{$field} or return;
        %><span class="field_error"><%= $Server->HTMLEncode( $error ) %></span><%
      };
    %>
    <form id="register_form" method="post" action="/handlers/myapp.register">
      <p>
        <label>Email:</label>
        <input type="text" name="email" value="<%= $Server->HTMLEncode( $Form->{email} ) %>" />
        <% $::err->("email"); %>
      </p>
      <p>
        <label>Password:</label>
        <input type="password" name="password" />
        <% $::err->("password"); %>
      </p>
      <p>
        <label>Confirm Password:</label>
        <input type="password" name="password2" />
        <% $::err->("password2"); %>
      </p>
      <p>
        <input type="submit" value="Register Now" />
      </p>
    </form>
    </asp:Content>

The form submits to the URL `/handlers/app.register` which means `handlers/app/register.pm`

File: `handlers/app/register.pm`

    package app::register;
    

    use strict;
    use warnings 'all';
    use base 'ASP4::FormHandler';
    use vars __PACKAGE__->VARS; # Import $Response, $Form, $Session, etc
    use App::db::user;
    

    sub run {
      my ($self, $context) = @_;
      

    # If there is an error, return the user to the registration page:
    if( my $errors = $self->validate() ) {
      $Session->{validation_errors} = $errors;
      $Session->{__lastArgs} = $Form;
      $Session->save;
      return $Response->Redirect( $ENV{HTTP_REFERER} );
    }
    

    # Create the user:
    my $user = eval {
      App::db::user->do_transaction(sub {
        return App::db::user->create(
          email     => $Form->{email},
          password  => $Form->{password},
        );
      });
    };
    

    if( $@ ) {

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    # See if the user already exists:
    if( App::db::user->count_search( email => $Form->{email} ) ) {
      $errors->{email} = "Already in use";
    }
    

      # Errors or not?:
      keys %$errors ? return $errors : return;
    }
    

    1;# return true:

File: `htdocs/profile.asp`

    <%@ Page UseMasterPage="/masters/global.asp" %>
    

    <asp:Content PlaceHolderID="meta_title">My Profile</asp:Content>
    

    <asp:Content PlaceHolderID="headline">My Profile</asp:Content>
    

    <asp:Content PlaceHolderID="main_content">
    <%
      if( my $msg = $Session->{msg} ) {
    %>
      <div class="message"><%= $msg %></div>
    <%
      }# end if()
    %>
    

    <%
      # Get our $user:
      use App::db::user;
      my $user = App::db::user->retrieve( $Session->{user_id} );
    %>
    

    <div style="float: left; width: 40%; border-right: solid 1px #000;">
      <h3>Incoming Messages</h3>
    <%
      foreach my $msg ( $user->messages_in(undef, { order_by => "created_on ASC"} ) ) {
    %>
      <div class="msg">
        <span class="from"><%= $msg->sender->email %></span> says:<br/>
        <div class="body"><%= $Server->HTMLEncode( $msg->body ) %></div>
        <span class="date"><%= $msg->created_on %></span>
      </div>
    <%
      }# end foreach()
    %>
    </div>
    

    <div style="float: right; width: 40%; border: dotted 1px #000;">
      <h3>Send New Message</h3>
      <form id="send_form" method="post" action="/handlers/app.send">
        <p>
          <label>Recipient:</label>
          <select name="to_user_id">
    <%
      my @users = App::db::user->search_where({
        user_id => {'!=' => $user->id }
      }, {
        order_by => "email"
      });
      foreach my $user ( @users ) {
    %>
            <option value="<%= $user->id %>"><%= $Server->HTMLEncode( $user->email ) %></option>
    <%
      }# end foreach()
    %>
          </select>
        </p>
        <p>
          <label>Subject:</label>
          <input type="text" name="subject" maxlength="100" />
        </p>
        <p>
          <label>Message:</label><br/>
          <textarea name="body"></textarea>
        </p>
        <p>
          <input type="submit" value="Send Message" />
        </p>
      </form>
    </div>
    </asp:Content>

The form submits to `/handlers/app.send` which maps to `handlers/app/send.pm`

File: `handlers/app/send.pm`

    package app::send;
    

    use strict;
    use warnings 'all';
    use base 'ASP4::FormHandler';
    use vars __PACKAGE__->VARS;
    use App::db::user;
    use App::db::message;
    

    sub run {
      my ($self, $context) = @_;
      

    # Create the message:
    my $msg = eval {
      App::db::message->do_transaction(sub {
        my $msg = App::db::message->create(
          from_user_id  => $Session->{user_id},
          to_user_id    => $Form->{to_user_id},
          subject       => $Form->{subject},
          body          => $Form->{body},
        );

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