/**
  * Provides editable columns for the extended models related StreakRegionalShipping_Shippable models.
  *
  * @param array $fieldSpecs
  * @return bool
  */
 public function provideEditableColumns(array &$fieldSpecs)
 {
     if (static::ModelClass == $this->owner->class) {
         $shippingRegions = Region_Shipping::get()->map()->toArray();
         $fieldSpecs += array('RegionID' => array('title' => 'Region', 'callback' => function ($record, $col) use($shippingRegions) {
             $field = new Select2Field('RegionID', '', $shippingRegions, $record ? $record->{$col} : null);
             $field->setValue($record->{$col});
             return $field;
         }), 'Price' => array('title' => 'Price', 'callback' => function ($record, $col) {
             return new NumericField($col, $col, $record ? $record->{$col} : null);
         }), 'ID' => array('title' => '', 'callback' => function ($record, $col) {
             return new HiddenField('ID', '', $record ? $record->{$col} : null);
         }));
         return true;
     }
     return false;
 }