static $has_many = array(
      "Recipients" => "Newsletter_Recipient",
      "SentRecipients" => "Newsletter_SentRecipient",
      "Attachments" => "NewsletterAttachment"
);

...

function getCMSFields($controller = null) {
      $group = DataObject::get_by_id("Group", $this->Parent()->GroupID);
      $sent_status_report = $this->renderWith("Newsletter_SentStatusReport");
      //$previewLink = Director::absoluteBaseURL() . 'admin/newsletter/preview/' . $this->ID;
      
      $attachments = new FileDataObjectManager(
                $this,
                'Attachments',
                'NewsletterAttachment',
                'Attachment',
                array(
                      'Title' => 'Title',
                      'Description' => 'Description'
                ),
                'getCMSFields_forPopup'
             );

      $ret = new FieldSet(
         new TabSet("Root",
            $mailTab = new Tab(_t('Newsletter.NEWSLETTER', 'Newsletter'),
               new TextField("Subject", _t('Newsletter.SUBJECT', 'Subject'), $this->Subject),
               new HtmlEditorField("Content", _t('Newsletter.CONTENT', 'Content'))
            ),
            $attachTab = new Tab(_t('Newsletter.ATTACHMENTS', 'Attachments'),
               $attachments
            ),
            $sentToTab = new Tab(_t('Newsletter.SENTREPORT', 'Sent Status Report'),
               new LiteralField("Sent Status Report", $sent_status_report)
            )
         )
      );

      if($this->Status != 'Draft') {
         $mailTab->push( new ReadonlyField("SendDate", _t('Newsletter.SENTAT', 'Sent at'), $this->SendDate) );
      }

      return $ret;
}

<?php

/**
* Single attachment to a newsletter
*
* @package newsletter
*/

class NewsletterAttachment extends DataObject
{
   static $db = array (
      'Title' => 'Varchar',
      'Description' => 'Text',
   );
   
   static $has_one = array (
      'Attachment' => 'File',
      'Newsletter' => 'Newsletter'
   );
   
   public function getCMSFields_forPopup()
   {
      return new FieldSet(
         new TextField('Title'),
         new TextareaField('Description', 'Description', 2),
         new FileIFrameField('Attachment')
      );
   }
}

[Notice] Undefined index: ID
GET /cms/admin/newsletter/NewsletterEditForm/field/Attachments/upload/

Line 261 in C:\wamp\www\cms\newsletter\code\NewsletterAdmin.php

Source

252          } else {
253             $form = $this->TypeEditForm();
254          }
255    }
256       if($form) $form->disableDefaultAction();
257       return $form;
258 }
259
260 public function NewsletterEditForm() {
261    $id = $_REQUEST['ID'] ? $_REQUEST['ID'] : $this->currentPageID();
262    if(!is_numeric($id)) {
263       $id = 0;
264    }
265    return $this->getNewsletterEditForm($id);
266 }
267

[Warning] DataObject::get_by_id passed a non-numeric ID #
GET /cms/admin/newsletter/NewsletterEditForm/field/Attachments/upload

Line 2566 in C:\wamp\www\cms\sapphire\core\model\DataObject.php
Source

2557             $tableClasses = ClassInfo::dataClassesFor($callerClass);
2558             $baseClass = array_shift($tableClasses);
2559             return DataObject::get_one($callerClass,"`$baseClass`.`ID` = $id");
2560
2561             // This simpler code will be used by non-DataObject classes that implement DataObjectInterface
2562          } else {
2563             return DataObject::get_one($callerClass,"`ID` = $id");
2564          }
2565       } else {
2566          user_error("DataObject::get_by_id passed a non-numeric ID #$id", E_USER_WARNING);
2567       }
2568    }
2569
2570    /**
2571     * Get the name of the base table for this object
2572     */

Trace

* DataObject::get_by_id passed a non-numeric ID #
Line 2566 of DataObject.php
* DataObject::get_by_id(Newsletter,)
Line 510 of NewsletterAdmin.php
* NewsletterAdmin->getNewsletterEditForm()
Line 262 of NewsletterAdmin.php
* NewsletterAdmin->NewsletterEditForm(HTTPRequest)
Line 162 of Controller.php
* Controller->handleAction(HTTPRequest)
Line 129 of RequestHandler.php
* RequestHandler->handleRequest(HTTPRequest)
Line 122 of Controller.php
* Controller->handleRequest(HTTPRequest)
Line 277 of Director.php
* Director::handleRequest(HTTPRequest,Session)
Line 121 of Director.php
* Director::direct(/admin/newsletter/NewsletterEditForm/field/Attachments/upload)
Line 118 of main.php