silverstripe-gridfieldexten.../src/GridFieldAddNewMultiClassHandler.php

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<?php
namespace SilverStripe\GridFieldExtensions;
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use SilverStripe\Control\Controller;
use SilverStripe\Forms\GridField\GridFieldDetailForm_ItemRequest;
/**
* A custom grid field request handler that allows interacting with form fields when adding records.
*/
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class GridFieldAddNewMultiClassHandler extends GridFieldDetailForm_ItemRequest
{
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public function Link($action = null)
{
if ($this->record->ID) {
return parent::Link($action);
} else {
return Controller::join_links(
$this->gridField->Link(),
'add-multi-class',
get_class($this->record)
);
}
}
}