SS Container Page Example

ContainterPage.php

<?php

class ContainterPage extends Page {

    static $db = array(
    );

    public function getCMSFields() {
        $fields  = new FieldList(
                $rootTab = new TabSet("Root", $tabMain = new Tab('Main', LabelField::create("ContainerWarning", "Container page does not have any editable properties")
                )
                )
        );
        return $fields;
    }

    public function getCMSActions() {
        $actions = parent::getCMSActions();
        $actions->removeByName("MajorActions");
        return $actions;
    }

    public static function FindOrCreate($title, $parent) {
        $result = $parent->Children()->find("Title", $title);
        if (!$result) {
            $result        = ContainterPage::create();
            $result->Title = $title;
            $result->setParent($parent);
            $result->write();
            $result->publish("Live", "Stage");
            $result->flushCache();
        }
        return $result;
    }

}

class ContainterPage_Controller extends Page_Controller {

    public function index() {
        $goTo = $goTo = $this->Parent()->Link();
        if ($this->Children()->Count()) {
            $goTo = $this->Children()->First()->Link();
        }
        $this->redirect($goTo);
    }

}

ContainterPageTestPage.php

<?php

/**
 * @property Date $PublishDate
 */
class ContainterPageTestPage extends Page {

    private static $can_be_root = false;
    private static $db          = array(
        "PublishDate" => "Date"
    );
    private $landingPage;
    private $yearPage;
    private $monthPage;

    public function getCMSFields() {
        $fields = parent::getCMSFields();
        $fields->addFieldToTab("Root.Main", DateField::create("PublishDate", "Publish Date")->setConfig('showcalendar', true), "Content");
        return $fields;
    }

    /**
     *
     * @return Page
     */
    private function getLandingPage() {
        if (!$this->landingPage) {
            $parent = $this->Parent();
            while ((int) $parent->ParentID !== 0 && $parent->exists()) {
                $parent = $parent->Parent();
            }
            $this->landingPage = $parent;
        }
        return $this->landingPage;
    }

    /**
     *
     * @return ContainterPage
     */
    private function getYearPage() {
        if (!$this->yearPage && $this->getLandingPage()) {
            $this->yearPage = ContainterPage::FindOrCreate($this->dbObject("PublishDate")->Format("Y"), $this->getLandingPage());
        }
        return $this->yearPage;
    }

    /**
     *
     * @return ContainterPage
     */
    private function getMonthPage() {
        if (!$this->monthPage && $this->getYearPage()) {
            $this->monthPage = ContainterPage::FindOrCreate($this->dbObject("PublishDate")->Format("F"), $this->getYearPage());
        }
        return $this->monthPage;
    }

    public function validate() {
        $result = parent::validate();

        if (!$this->PublishDate) {
            $this->PublishDate = Date::create();
            $this->PublishDate->setValue(time());
        }

        if (!$this->getLandingPage() || !$this->getLandingPage()->exists()) {
            $result->error("Unable to find parent landing page");
        }

        if (!$this->getYearPage() || !$this->getYearPage()->exists()) {
            $result->error("Unable to find year page");
        }
        if (!$this->getMonthPage() || !$this->getMonthPage()->exists()) {
            $result->error("Unable to find month page");
        }

        return $result;
    }

    protected function onBeforeWrite() {
        if (!$this->PublishDate) {
            $this->PublishDate = Date::create();
            $this->PublishDate->setValue(time());
        }
        $oldParent = $this->getParent();
        if ($oldParent->ID !== $this->getMonthPage()->ID) {
            $this->setParent($this->getMonthPage());
            $this->logChange(__FUNCTION__);
        }

        return parent::onBeforeWrite();
    }

    public function onAfterWrite() {
        $this->logChange(__FUNCTION__);
        return parent::onAfterWrite();
    }

    private function logChange($Caller) {
        $changedFields = $this->getChangedFields();
        if (isset($changedFields["ParentID"])) {
            Debug::log(__CLASS__ . "::" . $Caller . ": Changed ParentID " . $changedFields["ParentID"]["before"] . "=>" . $changedFields["ParentID"]["after"]);
        }
    }

}

class ContainterPageTestPage_Controller extends Page_Controller {
    
}