Call reminder email notification template

Question

Hello, 
 
 Is there an upgrade safe way of adding new custom fields to the email template for call reminders? 
 
 I can access the template in include/language/en_us.notify_template.html and customize it by creating custom/include/language/en_us.notify_template.html with the new text and fields. The new text works in the reminder emails, but field values don't (they show as empty). Is there a way to get the field values to work? 
 
 Kind regards, 
 Miska

Miska Husgafvel · Answer

This can be accomplished by extending the Class of target module (Calls) and override the method set_notification_body accordingly. 
 
 Create an extended Include with content like that: 
 
$objectList['Calls'] = 'Call';
$beanList['Calls'] = 'CustomCall';
$beanFiles['CustomCall'] = 'custom/modules/Calls/Call.php';

Create file custom/modules/Calls/Call.php with content like that, and implement overridden method accordingly: 
 class CustomCall extends Call {
 function set_notification_body($xtpl, $call) {
 $xtpl = parent::set_notification_body($xtpl, $call);

 // add your code here

 return $xtpl;
 }
} 
 
 Regards