whawha.php

<?php

    /**
     * assume $data['ID'] is an integer
     * 
     * when the object is queried, it has the correct data.
     * using both the method shown and $form->saveInto($school);
     * the write() creates a new object rather than update the queried object
     * 
     * @param $data
     * @param $form
     * @throws ValidationException
     * @throws null
     */
    public function doEditSchool($data, $form)
    {
        if($school = School::get()->byID($data['ID'])){
            $school->Title = $data['Title'];
            $school->Active = $data['Active'];
            $school->write();
        }
        $this->redirect(MemberManagementPage::get()->first()->Link('schools'));
    }