Hey guys,

I want in SS3 something like the DOM in DOM from 2.4.

I have an regular Page with a GridField

class MyPage extends Page{
static $has_many = array(
'FooDataObjects' => 'FooDataObject'
);

public function getCMSFields(){
$fields = parent::getCMSFields();
$config = GridFieldConfig_RelationEditor::create();

$foo = new GridField(
            	'FooDataObjects',
            	'FooDataObject',
            	$this->FooDataObjects(),
            	$config
        	); 
        	$fields->addFieldToTab("Root.Foo", $foo);
}
}

And now I want to set in the FooDataObject a second GridField:

class FooDataObject extends DataObject{
static $db = array(
			'Title' => 'Varchar(255)'
		);
		
		static $has_one = array(
			'MyPage' => 'MyPage'
		);
		
		static $has_many = array(
			'SecondFoos' => 'SecondFoo'
		);
		
		static $summary_fields = array(
      		'Title'		
    	);
    
    	public function getCMSFields()
    	{
        	$fields = parent::getCMSFields();
        	$fields->addFieldToTab('Root.Main', new TextField('Title'), 'Content');
        	
        	$config = GridFieldConfig_RelationEditor::create();
        	$secondFoo = new GridField(
				'SecondFoos',
				'SecondFoo',
				$this->SecondFoos(),
				$config        	
        	);
        	$fields->addFieldToTab('Root.SecondFoo', $secondFoo);
                return $fields;
    	}
}

class SecondFoo extends DataObject{
		static $db = array(
			'Title' => 'Varchar(255)',
			'Content' => 'Text'
		);
		
		static $summary_fields = array(
      		'Title'		
    	);
    	
    	static $has_one = array(
    		'FooDataObject' => 'FooDataObject'
    	);
    
     	//Fields for the DOM Popup
    	public function getCMSFields()
    	{
        	return new FieldSet(
        		new TextField('Title'),
        		new TextAreaField('Content')
        	);
    	}
	}

But in this case a got this error: Couldn't run query: SELECT DISTINCT count(DISTINCT "SecondFoo"."ID") AS "0" FROM "SecondFoo" WHERE ("ParentID" = '0') Unknown column 'ParentID' in 'where clause'

Does anyone know, what´s going wrong? Is it after all possible to use two GridFields like DOM in DOM?