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many_many Example

/*** TestPage.php ***/
class TestPage extends Page {
    public static $many_many=array(
        'TestObjects'=>'TestObject'
    );

    public static $many_many_extraFields=array(
        'TestObjects'=>array(
            'SortOrder'=>'Int'
        )
    );


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

        $conf=GridFieldConfig_RelationEditor::create(10);
        $conf->addComponent(new GridFieldSortableRows('SortOrder'));

        $fields->addFieldToTab('Root.TestObjects', new GridField('TestObjects', 'TestObjects', $this->TestObjects(), $conf));

        return $fields;
    }

    public function TestObjects() {
        return $this->getManyManyComponents('TestObjects')->sort('SortOrder');
    }
}


/*** TestObject.php ***/
class TestObject extends DataObject {
    public static $db=array(
        'Title'=>'Text'
    );

    public static $belongs_many_many=array(
        'TestPages'=>'TestPage'
    );
}
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