Source of file PersonalisationVariation.php

<?php

class PersonalisationVariation extends DataObject

{

    public static $db = array(

        "Name" => "Varchar(255)",

        "Description" => "Text"

    );

    public static $has_one = array(

        "Parent" => "VaryingPersonalisationScheme"

    );

    public static $summary_fields = array(

        "Name",

        "Description",

        "NiceClassName"

    );

    public function NiceClassName()

    {

        $cn = preg_replace('/(?!^)[[:upper:]]+/', ' \0', $this->ClassName);

        return $cn;

    }

    public function render(ContextProvider $context, Controller $controller = null)

    {

        // should be overridden by subclasses.

    }

    public static $called = false;

    /**

     * Get fields. This is a bit hacky to get around ModelAdmin limitations. Basically, if we are adding a new

     * record, we actually want to return the fields of the specific subclass not PersonalisationVariation itself.

     * So we look for that condition, and if we get it, we create a subclass instance and return it's fields. It will

     * in turn call this function, so we need to protect against multiple calls.

     * @return FieldList

     */

    public function getCMSFields()

    {

        if (isset($_REQUEST["sc"]) && !self::$called) {

            // just create an instance and return getCMSFields on that

            $subclass = $_REQUEST["sc"];

            $inst = new $subclass;

            // prevent handling this case again.

            self::$called = true;

            // Get the fields from the subclass. It will in turn self::getCMSFields, but that one will return the actual

            // fields of this class.

            return $inst->getCMSFields();

        }

        $fields = parent::getCMSFields();

        $fields->removeByName("ParentID");

        if ($helperText = $this->helperText()) {

            $helperText = "  - " . $helperText;

        }

        if (isset($_REQUEST["sc"])) {

            $subclass = $_REQUEST["sc"];

            if (ClassInfo::exists($subclass)) {

                $className = preg_replace('/(?!^)[[:upper:]]+/', ' \0', $subclass);

                $fields->addFieldToTab("Root.Main", new HiddenField("SubClass", "SubClass", $subclass));

                if (isset($_REQUEST["id"])) {

                    $fields->addFieldToTab("Root.Main", new HiddenField("ParentID", "ParentID", $_REQUEST["id"]));

                }

                $fields->addFieldToTab("Root.Main", new ReadonlyField("Class", "Variation Type", $className . $helperText), "Name");

            }

        } else {

            $className = preg_replace('/(?!^)[[:upper:]]+/', ' \0', $this->ClassName);

            $fields->addFieldToTab("Root.Main", new ReadonlyField("Class", "Variation Type", $className . $helperText), "Name");

        }

        return $fields;

    }

    /**

     * This returns helper text that is displayed at the top of the editor form for a personaliation variation.

     * Subclasses can override this function if they want to provide helper text.

     * @return string

     */

    public function helperText()

    {

        return "";

    }

    //do some stuff to save subclass information

    public function onBeforeWrite()

    {

        parent::onBeforeWrite();

        if (isset($_REQUEST["ParentID"])) {

            $this->ParentID = $_REQUEST["ParentID"];

        }

        if (isset($_REQUEST['SubClass']) && ClassInfo::exists($_REQUEST['SubClass'])) {

            $this->setClassName($_REQUEST['SubClass']);

        }

    }

    public function onAfterWrite()

    {

        parent::onAfterWrite();

        if (isset($_REQUEST['SubClass']) && ClassInfo::exists($_REQUEST['SubClass']) && !isset($written)) {

            $subclass = $this->newClassInstance($_REQUEST['SubClass']);

            foreach ($subclass->db() as $k => $v) {

                if (isset($_REQUEST[$k])) {

                    $subclass->$k = $_REQUEST[$k];

                }

            }

            $written = $subclass->write();

        }

    }

}