public function validate()
{
$result = parent::validate();
if (intval($this->OriginSurveyID) <= 0) {
$result->error('you need to specify a origin survey!');
}
if (intval($this->OriginFieldID) <= 0) {
$result->error('you need to specify a origin field!');
}
$survey_id = isset($_REQUEST['survey_template_id']) ? intval($_REQUEST['survey_template_id']) : $this->TargetSurveyID;
$current_template = SurveyTemplate::get()->byID($survey_id);
$old_mapping = $current_template->MigrationMappings()->first();
if (!is_null($old_mapping) && intval($old_mapping->OriginSurveyID) !== intval($this->OriginSurveyID)) {
$result->error('you need to specify the same origin survey for all your mappings');
}
return $result;
}