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SS3.1 - Problem with GridField one-to-one relationship




10 March 2014 at 9:41am Community Member, 17 Posts

I have two classes which I want to have a one-to-one relationship between them and be able to manage everything through GridField however GridField throws an error: [User Error] Uncaught LogicException: GridField doesn't have a modelClassName, so it doesn't know the columns of this grid.

These are my classes:
// Channel Page
class ChannelPage extends Page{
   private static $can_be_root = false;
   private static $has_one      = array( 'Image' => 'Photo' );
   public function getCMSFields(){
      $fields = parent::getCMSFields();
      $config = GridFieldConfig_RelationEditor::create();
$config->getComponentByType( 'GridFieldDataColumns' )->setDisplayFields( array(
         'Name'     => 'Name',
         'Description' => 'Description'
      ) );
$fields->addFieldToTab( 'Root.Image', new GridField( 'Image', 'Image', $this->Image(), $config ) );
      return $fields;

// PhotoDecorator
class PhotoDecorator extends DataExtension{
   static $has_one = array(
      'IndexPage'    => 'IndexPage',
      'ChannelPage'   => 'ChannelPage'   
   public function updateCMSFields( FieldList $fields ){
      $fields->removeByName( 'IndexPageID' );
      $fields->removeByName( 'ChannelPageID' );

// Photo
class Photo extends DataObject{
   private static $db = array(
      'Name'        => 'VARCHAR(255)',
      'Description' => 'Text'
   private static $has_one = array( 'Image' => 'Image' );