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Data Model Questions

DataObjectDecorator


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2 Posts   459 Views

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azt3k

19 June 2012 at 11:57am Community Member, 9 Posts

Has anyone managed to develop an extension that uses relationships?

I have tried to set up a dataobject decorator to allow comments to placed on multiple DataObjects. The result is something like this:

class Commentable extends DataObjectDecorator{

   public function extraStatics() {
      return array(
         'has_many'    => array(
            'Comments'      => 'Comment'
         )
      );
   }

   public function updateCMSFields($fields) {
      
      if(get_class($fields->fieldByName('Root.Content')) == 'TabSet'){

         $fields->addFieldsToTab('Root.Content.Comments', $this->getCommentFields());

      }elseif(get_class($fields->fieldByName('Root')) == 'TabSet'){

         $fields->addFieldsToTab('Root.Comments', $this->getCommentFields());

      }elseif(get_class($fields) == 'FieldSet'){
         foreach($this->getCommentFields() as $f){
            $fields->push($f);
         }
      }
      
   }

   protected function getCommentFields() {

      $fields = array();

      // Create complex table field for managing attached comments
      $CommentsField = new HasManyDataObjectManager(
         $this->owner,
         'Comments',
         'Comment',
         array(
            'Created'            => 'Date Posted',
            'Comment'          => 'Comment'
         ),
         'getCMSFields_forPopup'
      );
      $CommentsField->setParentClass('DataObject');

      $fields[] = $CommentsField;

      return $fields;
   }

   // other code here

}

with an associated DataObject here:

class Comment extends DataObject{
   
   public static $db = array(
      'Comment'   => 'HTMLText',
      'IsDeleted'   => 'Boolean'
   );

   public static $has_one = array(
      'OwnerObject'   => 'DataObject' // This line is fishy...
   );

   // other code here

}

Then add the extension to the Page class for argument's sake

Object::add_extension('Page', 'Commentable');

So the environment builder runs, tables get made - looks fine until I try to save a page - it throws an error - it seems like the dataobjectmanager / complex table get confused.

The error is as follows:

Error at \sapphire\core\Object.php line 724: Uncaught Exception: Object->__call(): the method 'setbyidlist' does not exist on 'DataObjectSet' (http://my.domain.tld/admin/EditForm)

Avatar
Willr

19 June 2012 at 6:13pm Forum Moderator, 5511 Posts

As an aside, there is a comments module which works on DataObjects (https://github.com/silverstripe/silverstripe-comments).