silverstripe-frameworktest/code/multiform/Page2MultiForm.php

<?php
 
class Page2MultiForm extends MultiForm {
	
	public static $start_step = 'Page2PersonalDetailsFormStep';
	
	public function finish($data, $form) {
	      parent::finish($data, $form);
	      $steps = DataObject::get('MultiFormStep', "SessionID = {$this->session->ID}");
	      if($steps) {
	         foreach($steps as $step) {
	            if($step->class == 'Page2PersonalDetailsFormStep') {
	               $member = new Member();
	               $data = $step->loadData();
	               if($data) {
	                  $member->update($data);
	                  $member->write();
	               }
	            }

	            if($step->class == 'Page2OrganisationDetailsFormStep') {
	               $organisation = new Organisation();
	               $data = $step->loadData();
	               if($data) {
	                  $organisation->update($data);
	                  if($member && $member->ID) $organisation->MemberID = $member->ID;
	                  $organisation->write();
	               }
	            }

	            // Debug::show($step->loadData()); // Shows the step data (unserialized by loadData)
	         }
	      }
	      $controller = $this->getController();
	      $controller->redirect($controller->Link() . 'finished');
	}
}

class Page2PersonalDetailsFormStep extends MultiFormStep {
	
	public static $next_steps = 'Page2OrganisationDetailsFormStep';
	
	function getFields() {
		return new FieldList(
			new TextField('FirstName', 'First name'),
			new TextField('Surname', 'Surname')
		);
	}

}

class Page2OrganisationDetailsFormStep extends MultiFormStep {
 
   public static $is_final_step = true;

	function getFields() {
		return new FieldList(
			new TextField('OrganisationName', 'Organisation Name')
		);
	}
 
}
 
?>