Add several methods to support writeable local cache

src/Models/BaseElement.php

@@ -371,6 +371,17 @@ public function getController()
         return $this->controller;
     }
 
+    /**
+     * @param string $name
+     * @return $this
+     */
+    public function setAreaRelationNameCache(string $name)
+    {
+        $this->cacheData['area_relation_name'] = $name;
+
+        return $this;
+    }
+
     /**
      * @return Controller
      */

src/Models/ElementalArea.php

@@ -8,6 +8,7 @@
 use SilverStripe\Core\Extensible;
 use SilverStripe\Core\Injector\Injector;
 use SilverStripe\ORM\ArrayList;
+use SilverStripe\ORM\DataList;
 use SilverStripe\ORM\DataObject;
 use SilverStripe\ORM\FieldType\DBField;
 use SilverStripe\ORM\FieldType\DBHTMLText;
@@ -87,6 +88,41 @@ public function forTemplate()
         return $this->renderWith(static::class);
     }
 
+    /**
+     * @param ArrayList $elements
+     * @return $this
+     */
+    public function setElementsCached(ArrayList $elements)
+    {
+        $this->cacheData['elements'] = $elements;
+
+        return $this;
+    }
+
+    /**
+     * @param DataObject $page
+     * @return $this
+     */
+    public function setOwnerPageCached(DataObject $page)
+    {
+        $this->cacheData['owner_page'] = $page;
+
+        return $this;
+    }
+
+    /**
+     * A cache-aware accessor for the elements
+     * @return ArrayList|DataList
+     */
+    public function Elements()
+    {
+        if (isset($this->cacheData['elements'])) {
+            return $this->cacheData['elements'];
+        }
+
+        return parent::Elements();
+    }
+
     /**
      * Necessary to display results in CMS site search.
      *