Extending existing ModelAdmin#

Sometimes you'll work with ModelAdmins from other modules. To customise these interfaces, you can always subclass. But there's also another tool at your disposal: The Extension API.

php
namespace App\Extension;

use SilverStripe\Core\Extension;

class MyAdminExtension extends Extension
{
    protected function updateEditForm($form)
    {
        $form->Fields()->push(/* ... */)
    }
}

Now enable this extension through your config.yml file (see the configuration documentation).

yaml
MyAdmin:
  extensions:
    - App\Extension\MyAdminExtension

The following extension points are available: updateEditForm(), updateList(), updateImportForm.