I Just wanted to display a ManyMany-Relation with the ManyManyDataObjectManager.

But I always get following error:
Fatal error: Access to undeclared static property: ViewableData::$many_many in ~\sapphire\core\Object.php(376) : eval()'d code on line 1

My DataObject looks like this:
class ContentDataObject extends DataObject {
   
   static $db = array (
      "Title" => "Varchar(255)",
      //...
   );
   

   static $many_many = array (
      "Connections" => "ArticleDataObject",
   );
   
      
   static $belongs_many_many = array (
      "ConnectionsBelongs" => "ContentDataObject",
   );
}

The Manager in the Page looks like this (If I replace "ManyManyDataObjectManager" with "DataObjectManager" is working):
$manager = new ManyManyDataObjectManager(
         $this,
         'CurrentContent',
         'ContentDataObject',
         $this->getListedFields(),
         'getCMSFields_forPopup'
      );
      return $manager;

System:
SS 2.3.1
dataobject_manager r117

Any ideas how to solve the error?

Cheers,

Malte

Hi UncleCheese,

thanks for your fast reply.
Here is the PageObject...

class MagazinDataPage extends DataPage
{
   static $db = array (
   );
   
   static $has_many = array (
      'Content' => 'ContentDataObject'
   );
   
   static $allowed_children = array("MagazinDataPage");
   
   public function getCMSFields($cms) {
      $fields = parent::getCMSFields($cms);
//      $fields->addFieldToTab("Root.Content.Current", $this->getCurrentContentManager());
//      $fields->addFieldToTab("Root.Content.LastChanged", $this->getStoreManager());
//      $fields->addFieldToTab("Root.Content.Archiv", $this->getZIPManager());
      $fields->addFieldToTab("Root.Content.All", $this->getAllContentManager());
      return $fields;
   }
   
   protected function getAllContentManager() {
      $manager = new ManyManyDataObjectManager(
         $this,
         'CurrentContent',
         'ContentDataObject',
         $this->getListedFields(),
         'getCMSFields_forPopup'/*,
         "MagazinDataPageID = {$this->ID}"*/
      );
//      $manager->setParentClass('MagazinDataPage');
      $manager->setFilter("ClassName", "ContentType", ContentDataObject::getContentTypeClasses());
      return $manager;
   }
   
   protected function getListedFields() {
      return array(
            "ClassName" => "ContentType",
            "Title" => "Titel",
            "ShowOn" => "Erscheinungsdatum",
            "Disabled" => "Versteckt",
            "HideOn"=> "Ausblendungsdatum"
         );
   }
   
}

class MagazinDataPage_Controller extends DataPage_Controller
{

}

Cheers,

Malte

But than my Konzept does not work.

I would like to have
Page => $has_many DataObjects
DataObject => $has_one Page

DataObject => $many_many DataObjects
DataObject => $belongs_many_many DataObjects

So a DataObect is stored in one Page.
And all DataObjects can be connected to each other.

How can I solve this? I don't want to have each DataObject as Page or did I get something wrong?

Cheers,

Malte

Thanks for your help.

Generally it works, but if you have more than 20 Objects available. It's not managable anymore.
I have to rework this part of my concept.