/**
* Return a GridField configured for editing attached MediaModels. If the master record is in the database
* then also add GridFieldOrderableRows (otherwise complaint re UnsavedRelationList not being a DataList happens).
*
* @param string|null $relationshipName
* @param string|null $configClassName name of grid field configuration class otherwise one is manufactured
* @return \GridField
*/
protected function gridField($relationshipName = null, $configClassName = null)
{
$relationshipName = $relationshipName ?: static::RelationshipName;
$config = $this->gridFieldConfig($relationshipName, $configClassName);
/** @var GridField $gridField */
$gridField = \GridField::create($relationshipName, $relationshipName, $this->owner->{$relationshipName}(), $config);
return $gridField;
}
