CustomModelAdminAction.php

<?php

namespace MyApp\Extension;

use MyApp\Model\Reservation;
use SilverStripe\Control\Controller;
use SilverStripe\Control\HTTPResponse;
use SilverStripe\Core\Extension;
use SilverStripe\Forms\FieldList;
use SilverStripe\Forms\FormAction;
use SilverStripe\Forms\GridField\GridFieldDetailForm_ItemRequest;
use SilverStripe\ORM\FieldType\DBHTMLText;
use SilverStripe\ORM\ValidationResult;

/**
 * Class GridFieldDetailForm_ItemRequestExtension
 * @package MyApp\Extension
 */
class GridFieldDetailForm_ItemRequestExtension extends Extension
{
    /**
     * @var array
     */
    private static $allowed_actions = [
        'approveReservation',
        'denyReservation',
        'pendingReservation',
    ];

    /**
     * @param FieldList $actions
     */
    public function updateFormActions(FieldList $actions)
    {
        $record = $this->owner->getRecord();
        // This extension would run on every GridFieldDetailForm, so ensure you ignore contexts where
        // you are managing a DataObject you don't care about
        if (!$record instanceof Reservation || !$record->exists()) {
            return;
        }

        $approve = FormAction::create('approveReservation', 'Approve Reservation')
            ->setUseButtonTag(true)
            ->addExtraClass('btn btn-primary');

        $deny = FormAction::create('denyReservation', 'Deny Reservation')
            ->setUseButtonTag(true)
            ->addExtraClass('btn btn-primary');

        $pending = FormAction::create('pendingReservation', 'Mark As Pending')
            ->setUseButtonTag(true)
            ->addExtraClass('btn btn-primary');

        if ($record->Status == 'Pending') {
            $actions->fieldByName('MajorActions')->push($approve);
            $actions->fieldByName('MajorActions')->push($deny);
        } elseif ($record->Status == 'Approved') {
            $actions->fieldByName('MajorActions')->push($pending);
            $actions->fieldByName('MajorActions')->push($deny);
        } else {
            $actions->fieldByName('MajorActions')->push($approve);
            $actions->fieldByName('MajorActions')->push($pending);
        }
    }

    /**
     * @param $data
     * @param $form
     * @return HTTPResponse
     */
    public function approveReservation($data, $form)
    {
        // Check permission
        if (!$this->owner->getRecord()->canEdit()) {
            return $this->owner->httpError(403);
        }

        $record = $this->owner->getRecord();
        $record->Status = 'Approved';
        $record->write();

        $link = '<a href="' . $this->owner->Link('edit') . '">"'
            . htmlspecialchars($this->owner->getRecord()->Title, ENT_QUOTES)
            . '"</a>';
        $message = _t(
            'SilverStripe\\Forms\\GridField\\GridFieldDetailForm.Saved',
            'Approved {name} {link}',
            [
                'name' => $this->owner->getRecord()->i18n_singular_name(),
                'link' => $link,
            ]
        );

        $form->sessionMessage($message, 'good', ValidationResult::CAST_HTML);

        // Redirect after save
        return $this->fetchToplevelController()->redirect($this->owner->Link());
    }

    /**
     * @param $data
     * @param $form
     * @return HTTPResponse
     */
    public function denyReservation($data, $form)
    {
        // Check permission
        if (!$this->owner->getRecord()->canEdit()) {
            return $this->owner->httpError(403);
        }

        $record = $this->owner->getRecord();
        $record->Status = 'Denied';
        $record->write();

        $link = '<a href="' . $this->owner->Link('edit') . '">"'
            . htmlspecialchars($this->owner->getRecord()->Title, ENT_QUOTES)
            . '"</a>';
        $message = _t(
            'SilverStripe\\Forms\\GridField\\GridFieldDetailForm.Saved',
            'Denied {name} {link}',
            [
                'name' => $this->owner->getRecord()->i18n_singular_name(),
                'link' => $link,
            ]
        );

        $form->sessionMessage($message, 'good', ValidationResult::CAST_HTML);

        // Redirect after save
        return $this->fetchToplevelController()->redirect($this->owner->Link());
    }

    /**
     * @param $data
     * @param $form
     * @return HTTPResponse
     */
    public function pendingReservation($data, $form)
    {
        // Check permission
        if (!$this->owner->getRecord()->canEdit()) {
            return $this->owner->httpError(403);
        }

        $record = $this->owner->getRecord();
        $record->Status = 'Pending';
        $record->write();

        $link = '<a href="' . $this->owner->Link('edit') . '">"'
            . htmlspecialchars($this->owner->getRecord()->Title, ENT_QUOTES)
            . '"</a>';
        $message = _t(
            'SilverStripe\\Forms\\GridField\\GridFieldDetailForm.Saved',
            'Marked as Pending {name} {link}',
            [
                'name' => $this->owner->getRecord()->i18n_singular_name(),
                'link' => $link,
            ]
        );

        $form->sessionMessage($message, 'good', ValidationResult::CAST_HTML);

        // Redirect after save
        return $this->fetchToplevelController()->redirect($this->owner->Link());
    }

    /**
     * Traverse the nested RequestHandlers until we reach something that's not GridFieldDetailForm_ItemRequest.
     * This allows us to access the Controller responsible for invoking the top-level GridField.
     * This should be equivalent to getting the controller off the top of the controller stack via Controller::curr(),
     * but allows us to avoid accessing the global state.
     *
     * GridFieldDetailForm_ItemRequests are RequestHandlers, and as such they are not part of the controller stack.
     *
     * @return Controller
     */
    protected function fetchToplevelController()
    {
        $c = $this->owner->getController();
        while ($c && $c instanceof GridFieldDetailForm_ItemRequest) {
            $c = $c->getController();
        }
        return $c;
    }
}