possible solution for rendering when using Elemental

[jellygnite]

I noticed that the analysis in PageHealthExtension didn't take into account any Elemental blocks. I couldn't see how you would use the seoContentFields configuration so I tried rendering with the current theme.

public function getRenderedHtml() {
... 
$current_themes = SSViewer::get_themes();  // get current CMS theme
Requirements::clear(); // we only want the HTML, not any of the js or css
SSViewer::set_themes(SSViewer::config()->uninherited('themes'));
$this->renderedHtml = $controllerName::singleton()->render($this->owner);
Requirements::restore(); // put the js/css requirements back when we're done
SSViewer::set_themes($current_themes);  // reset current CMS theme when we're done
...
}

[Fremmedkar]

You can use seoContentFields by casting the result of getElementsForSearch in ElementalPageExtension as Text in your Page class

private static $casting = [
    'ElementalContent' => 'Text'
];

public function getElementalContent()
{
    return $this->hasExtension(ElementalPageExtension::class) ? $this->getElementsForSearch() : '';
}

public function seoContentFields()
{
    return [
        'Content',
        'ElementalContent'
    ];
}