SilverStripe 3.1.x DataObject

SS-DataObject.php

<?php

class MyDataObject extends DataObject {

    private static $singular_name = 'MyDataObject';
    private static $plural_name = 'MyDataObjects';

    private static $db = array(
        'Sort' => 'Int'
    );

    private static $default_sort = 'Sort';


    private static $has_one = array(
    );

    private static $has_many = array(
    );

    private static $many_many = array(
    );

    private static $summary_fields = array(
    );

    private static $field_labels = array(
    );


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

        $fields->removeByName('Sort');


        return $fields;
    }


    protected function onBeforeWrite(){
        if (!$this->Sort) {
            $this->Sort = MyDataObject::get()->max('Sort') + 1;
        }
        parent::onBeforeWrite();
    }

}